diff --git a/lib/big_endian_span_test.cc b/lib/big_endian_span_test.cc
index dcc673ab..70c97212 100644
--- a/lib/big_endian_span_test.cc
+++ b/lib/big_endian_span_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/big_endian_span.h>
 
 #include <cstdint>
diff --git a/lib/bit_ops_test.cc b/lib/bit_ops_test.cc
index 18377785..ede093bf 100644
--- a/lib/bit_ops_test.cc
+++ b/lib/bit_ops_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/bit_ops.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/database.cc b/lib/database.cc
index 6fac62db..e9d767bf 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/database.h>
 
 #include <glob.h>
diff --git a/lib/include/prjxray/big_endian_span.h b/lib/include/prjxray/big_endian_span.h
index 683f9c3f..7f3ee52b 100644
--- a/lib/include/prjxray/big_endian_span.h
+++ b/lib/include/prjxray/big_endian_span.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_BIG_ENDIAN_SPAN
 #define PRJXRAY_LIB_BIG_ENDIAN_SPAN
 
diff --git a/lib/include/prjxray/bit_ops.h b/lib/include/prjxray/bit_ops.h
index c7d3fa8b..605cd7b2 100644
--- a/lib/include/prjxray/bit_ops.h
+++ b/lib/include/prjxray/bit_ops.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_BIT_OPS_H
 #define PRJXRAY_LIB_BIT_OPS_H
 
diff --git a/lib/include/prjxray/database.h b/lib/include/prjxray/database.h
index 76b10935..2399d797 100644
--- a/lib/include/prjxray/database.h
+++ b/lib/include/prjxray/database.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_DATABASE_H
 #define PRJXRAY_LIB_DATABASE_H
 
diff --git a/lib/include/prjxray/memory_mapped_file.h b/lib/include/prjxray/memory_mapped_file.h
index 9a944b70..6aeb8210 100644
--- a/lib/include/prjxray/memory_mapped_file.h
+++ b/lib/include/prjxray/memory_mapped_file.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_MEMORY_MAPPED_FILE
 #define PRJXRAY_LIB_MEMORY_MAPPED_FILE
 
diff --git a/lib/include/prjxray/segbits_file_reader.h b/lib/include/prjxray/segbits_file_reader.h
index 19c4f51a..8635acb0 100644
--- a/lib/include/prjxray/segbits_file_reader.h
+++ b/lib/include/prjxray/segbits_file_reader.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_SEGBITS_FILE_READER_H
 #define PRJXRAY_LIB_SEGBITS_FILE_READER_H
 
diff --git a/lib/include/prjxray/xilinx/architectures.h b/lib/include/prjxray/xilinx/architectures.h
index cdf992e6..60087f3f 100644
--- a/lib/include/prjxray/xilinx/architectures.h
+++ b/lib/include/prjxray/xilinx/architectures.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_ARCHITECTURES_H_
 #define PRJXRAY_LIB_XILINX_ARCHITECTURES_H_
 
diff --git a/lib/include/prjxray/xilinx/bitstream_reader.h b/lib/include/prjxray/xilinx/bitstream_reader.h
index 5464a520..bae16bc1 100644
--- a/lib/include/prjxray/xilinx/bitstream_reader.h
+++ b/lib/include/prjxray/xilinx/bitstream_reader.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_BITSTREAM_READER_H
 #define PRJXRAY_LIB_XILINX_BITSTREAM_READER_H
 
diff --git a/lib/include/prjxray/xilinx/bitstream_writer.h b/lib/include/prjxray/xilinx/bitstream_writer.h
index 09d69f45..81cddaf4 100644
--- a/lib/include/prjxray/xilinx/bitstream_writer.h
+++ b/lib/include/prjxray/xilinx/bitstream_writer.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 /*
  * Takes in a collection of ConfigurationPacket and writes them to specified
  * file This includes the following: -Bus auto detection -Sync Word -FPGA
diff --git a/lib/include/prjxray/xilinx/configuration.h b/lib/include/prjxray/xilinx/configuration.h
index 6236345c..89fad613 100644
--- a/lib/include/prjxray/xilinx/configuration.h
+++ b/lib/include/prjxray/xilinx/configuration.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_CONFIGURATION_H_
 #define PRJXRAY_LIB_XILINX_CONFIGURATION_H_
 
diff --git a/lib/include/prjxray/xilinx/configuration_packet.h b/lib/include/prjxray/xilinx/configuration_packet.h
index 4df21052..4940ee0f 100644
--- a/lib/include/prjxray/xilinx/configuration_packet.h
+++ b/lib/include/prjxray/xilinx/configuration_packet.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_CONFIGURATION_PACKET_H
 #define PRJXRAY_LIB_XILINX_CONFIGURATION_PACKET_H
 
diff --git a/lib/include/prjxray/xilinx/configuration_packet_with_payload.h b/lib/include/prjxray/xilinx/configuration_packet_with_payload.h
index 05619386..f5bac5f0 100644
--- a/lib/include/prjxray/xilinx/configuration_packet_with_payload.h
+++ b/lib/include/prjxray/xilinx/configuration_packet_with_payload.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_CONFIGURATION_PACKET_WITH_PAYLOAD_H
 #define PRJXRAY_LIB_XILINX_CONFIGURATION_PACKET_WITH_PAYLOAD_H
 
diff --git a/lib/include/prjxray/xilinx/configuration_register.h b/lib/include/prjxray/xilinx/configuration_register.h
index 0699f6cc..93e292e7 100644
--- a/lib/include/prjxray/xilinx/configuration_register.h
+++ b/lib/include/prjxray/xilinx/configuration_register.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_CONFIGURATION_REGISTER_H_
 #define PRJXRAY_LIB_XILINX_CONFIGURATION_REGISTER_H_
 
diff --git a/lib/include/prjxray/xilinx/frames.h b/lib/include/prjxray/xilinx/frames.h
index f4a96f1d..ceb0950f 100644
--- a/lib/include/prjxray/xilinx/frames.h
+++ b/lib/include/prjxray/xilinx/frames.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_FRAMES_H
 #define PRJXRAY_LIB_XILINX_FRAMES_H
 
diff --git a/lib/include/prjxray/xilinx/nop_packet.h b/lib/include/prjxray/xilinx/nop_packet.h
index 6f89e84d..aec8ae1e 100644
--- a/lib/include/prjxray/xilinx/nop_packet.h
+++ b/lib/include/prjxray/xilinx/nop_packet.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_NOP_PACKET_H
 #define PRJXRAY_LIB_XILINX_NOP_PACKET_H
 
diff --git a/lib/include/prjxray/xilinx/spartan6/block_type.h b/lib/include/prjxray/xilinx/spartan6/block_type.h
index a42a8db4..fdaa1d84 100644
--- a/lib/include/prjxray/xilinx/spartan6/block_type.h
+++ b/lib/include/prjxray/xilinx/spartan6/block_type.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_BLOCK_TYPE_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_BLOCK_TYPE_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/command.h b/lib/include/prjxray/xilinx/spartan6/command.h
index 93bafdb1..09c894bf 100644
--- a/lib/include/prjxray/xilinx/spartan6/command.h
+++ b/lib/include/prjxray/xilinx/spartan6/command.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_COMMAND_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_COMMAND_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/configuration_bus.h b/lib/include/prjxray/xilinx/spartan6/configuration_bus.h
index a5d0081b..c81597fd 100644
--- a/lib/include/prjxray/xilinx/spartan6/configuration_bus.h
+++ b/lib/include/prjxray/xilinx/spartan6/configuration_bus.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_CONFIGURATION_BUS_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_CONFIGURATION_BUS_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/configuration_column.h b/lib/include/prjxray/xilinx/spartan6/configuration_column.h
index af8edd63..859ba263 100644
--- a/lib/include/prjxray/xilinx/spartan6/configuration_column.h
+++ b/lib/include/prjxray/xilinx/spartan6/configuration_column.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_CONFIGURATION_COLUMN_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_CONFIGURATION_COLUMN_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/configuration_row.h b/lib/include/prjxray/xilinx/spartan6/configuration_row.h
index a2b267eb..2b766b2d 100644
--- a/lib/include/prjxray/xilinx/spartan6/configuration_row.h
+++ b/lib/include/prjxray/xilinx/spartan6/configuration_row.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_ROW_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_ROW_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/frame_address.h b/lib/include/prjxray/xilinx/spartan6/frame_address.h
index 651d86af..a060995e 100644
--- a/lib/include/prjxray/xilinx/spartan6/frame_address.h
+++ b/lib/include/prjxray/xilinx/spartan6/frame_address.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_FRAME_ADDRESS_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_FRAME_ADDRESS_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/global_clock_region.h b/lib/include/prjxray/xilinx/spartan6/global_clock_region.h
index bb0ce93a..87eadb96 100644
--- a/lib/include/prjxray/xilinx/spartan6/global_clock_region.h
+++ b/lib/include/prjxray/xilinx/spartan6/global_clock_region.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_GLOBAL_CLOCK_REGION_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_GLOBAL_CLOCK_REGION_H_
 
diff --git a/lib/include/prjxray/xilinx/spartan6/part.h b/lib/include/prjxray/xilinx/spartan6/part.h
index df113848..3f9029f5 100644
--- a/lib/include/prjxray/xilinx/spartan6/part.h
+++ b/lib/include/prjxray/xilinx/spartan6/part.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_SPARTAN6_PART_H_
 #define PRJXRAY_LIB_XILINX_SPARTAN6_PART_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/block_type.h b/lib/include/prjxray/xilinx/xc7series/block_type.h
index 400a19fc..dbf15c0a 100644
--- a/lib/include/prjxray/xilinx/xc7series/block_type.h
+++ b/lib/include/prjxray/xilinx/xc7series/block_type.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_BLOCK_TYPE_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_BLOCK_TYPE_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/command.h b/lib/include/prjxray/xilinx/xc7series/command.h
index 2ff16e86..266056ab 100644
--- a/lib/include/prjxray/xilinx/xc7series/command.h
+++ b/lib/include/prjxray/xilinx/xc7series/command.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_COMMAND_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_COMMAND_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_bus.h b/lib/include/prjxray/xilinx/xc7series/configuration_bus.h
index 33e9619e..0b9a77a1 100644
--- a/lib/include/prjxray/xilinx/xc7series/configuration_bus.h
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_bus.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_BUS_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_BUS_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_column.h b/lib/include/prjxray/xilinx/xc7series/configuration_column.h
index b15415e2..35efd365 100644
--- a/lib/include/prjxray/xilinx/xc7series/configuration_column.h
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_column.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_COLUMN_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_COLUMN_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h b/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h
index 06307378..d7c2cb55 100644
--- a/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_OPTIONS_0_VALUE_H
 #define PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_OPTIONS_0_VALUE_H
 
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_row.h b/lib/include/prjxray/xilinx/xc7series/configuration_row.h
index 4cb7f567..70043990 100644
--- a/lib/include/prjxray/xilinx/xc7series/configuration_row.h
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_row.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_ROW_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_ROW_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/crc.h b/lib/include/prjxray/xilinx/xc7series/crc.h
index df6bcac8..3aaac1ba 100644
--- a/lib/include/prjxray/xilinx/xc7series/crc.h
+++ b/lib/include/prjxray/xilinx/xc7series/crc.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_CRC_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_CRC_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/ecc.h b/lib/include/prjxray/xilinx/xc7series/ecc.h
index 63513fd9..7d832d2e 100644
--- a/lib/include/prjxray/xilinx/xc7series/ecc.h
+++ b/lib/include/prjxray/xilinx/xc7series/ecc.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_ECC_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_ECC_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/frame_address.h b/lib/include/prjxray/xilinx/xc7series/frame_address.h
index c15b87f4..6247f534 100644
--- a/lib/include/prjxray/xilinx/xc7series/frame_address.h
+++ b/lib/include/prjxray/xilinx/xc7series/frame_address.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_FRAME_ADDRESS_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_FRAME_ADDRESS_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/global_clock_region.h b/lib/include/prjxray/xilinx/xc7series/global_clock_region.h
index 8d791a25..83e81fda 100644
--- a/lib/include/prjxray/xilinx/xc7series/global_clock_region.h
+++ b/lib/include/prjxray/xilinx/xc7series/global_clock_region.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_GLOBAL_CLOCK_REGION_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_GLOBAL_CLOCK_REGION_H_
 
diff --git a/lib/include/prjxray/xilinx/xc7series/part.h b/lib/include/prjxray/xilinx/xc7series/part.h
index 90847e44..e063fb5e 100644
--- a/lib/include/prjxray/xilinx/xc7series/part.h
+++ b/lib/include/prjxray/xilinx/xc7series/part.h
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #ifndef PRJXRAY_LIB_XILINX_XC7SERIES_PART_H_
 #define PRJXRAY_LIB_XILINX_XC7SERIES_PART_H_
 
diff --git a/lib/memory_mapped_file.cc b/lib/memory_mapped_file.cc
index e6ada907..1b5204d8 100644
--- a/lib/memory_mapped_file.cc
+++ b/lib/memory_mapped_file.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/memory_mapped_file.h>
 
 #include <fcntl.h>
diff --git a/lib/memory_mapped_file_test.cc b/lib/memory_mapped_file_test.cc
index 6a4477d6..ab925a6b 100644
--- a/lib/memory_mapped_file_test.cc
+++ b/lib/memory_mapped_file_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/memory_mapped_file.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/segbits_file_reader.cc b/lib/segbits_file_reader.cc
index b06b674e..1837ca66 100644
--- a/lib/segbits_file_reader.cc
+++ b/lib/segbits_file_reader.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/segbits_file_reader.h>
 
 namespace prjxray {
diff --git a/lib/segbits_file_reader_test.cc b/lib/segbits_file_reader_test.cc
index 3ac90e17..cc2b6299 100644
--- a/lib/segbits_file_reader_test.cc
+++ b/lib/segbits_file_reader_test.cc
@@ -1,3 +1,13 @@
+/*
+ *
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/segbits_file_reader.h>
 
 #include <map>
diff --git a/lib/xilinx/bitstream_writer.cc b/lib/xilinx/bitstream_writer.cc
index 809c06f1..fe06664f 100644
--- a/lib/xilinx/bitstream_writer.cc
+++ b/lib/xilinx/bitstream_writer.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <iostream>
 
 #include <prjxray/bit_ops.h>
diff --git a/lib/xilinx/configuration.cc b/lib/xilinx/configuration.cc
index d7d6626c..881d9cd2 100644
--- a/lib/xilinx/configuration.cc
+++ b/lib/xilinx/configuration.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <fstream>
 #include <iostream>
 
diff --git a/lib/xilinx/configuration_packet.cc b/lib/xilinx/configuration_packet.cc
index 14d66b0b..a0832bb6 100644
--- a/lib/xilinx/configuration_packet.cc
+++ b/lib/xilinx/configuration_packet.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/configuration_packet.h>
 
 #include <iomanip>
diff --git a/lib/xilinx/configuration_register.cc b/lib/xilinx/configuration_register.cc
index 2e49c541..f3f0f2ff 100644
--- a/lib/xilinx/configuration_register.cc
+++ b/lib/xilinx/configuration_register.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/configuration_register.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/frames.cc b/lib/xilinx/frames.cc
index 616c7232..5f36f6f5 100644
--- a/lib/xilinx/frames.cc
+++ b/lib/xilinx/frames.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/frames.h>
 #include <prjxray/xilinx/xc7series/ecc.h>
 
diff --git a/lib/xilinx/spartan6/block_type.cc b/lib/xilinx/spartan6/block_type.cc
index 44059729..5b2a9067 100644
--- a/lib/xilinx/spartan6/block_type.cc
+++ b/lib/xilinx/spartan6/block_type.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/block_type.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/spartan6/configuration_bus.cc b/lib/xilinx/spartan6/configuration_bus.cc
index 920efd5c..4d6d8f19 100644
--- a/lib/xilinx/spartan6/configuration_bus.cc
+++ b/lib/xilinx/spartan6/configuration_bus.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_bus.h>
 
 #include <iostream>
diff --git a/lib/xilinx/spartan6/configuration_column.cc b/lib/xilinx/spartan6/configuration_column.cc
index dcc8422a..3d9caa32 100644
--- a/lib/xilinx/spartan6/configuration_column.cc
+++ b/lib/xilinx/spartan6/configuration_column.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_column.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/spartan6/configuration_row.cc b/lib/xilinx/spartan6/configuration_row.cc
index bb347e72..c5763980 100644
--- a/lib/xilinx/spartan6/configuration_row.cc
+++ b/lib/xilinx/spartan6/configuration_row.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_row.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/spartan6/frame_address.cc b/lib/xilinx/spartan6/frame_address.cc
index ff5bceeb..601e3581 100644
--- a/lib/xilinx/spartan6/frame_address.cc
+++ b/lib/xilinx/spartan6/frame_address.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <iomanip>
 
 #include <prjxray/bit_ops.h>
diff --git a/lib/xilinx/spartan6/global_clock_region.cc b/lib/xilinx/spartan6/global_clock_region.cc
index 55e194e8..8af9ed74 100644
--- a/lib/xilinx/spartan6/global_clock_region.cc
+++ b/lib/xilinx/spartan6/global_clock_region.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/global_clock_region.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/spartan6/part.cc b/lib/xilinx/spartan6/part.cc
index b74aff54..a8215e35 100644
--- a/lib/xilinx/spartan6/part.cc
+++ b/lib/xilinx/spartan6/part.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/part.h>
 
 #include <iomanip>
diff --git a/lib/xilinx/tests/spartan6/bitstream_reader_test.cc b/lib/xilinx/tests/spartan6/bitstream_reader_test.cc
index 4f807bd4..248d77a1 100644
--- a/lib/xilinx/tests/spartan6/bitstream_reader_test.cc
+++ b/lib/xilinx/tests/spartan6/bitstream_reader_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <array>
 
 #include <absl/types/span.h>
diff --git a/lib/xilinx/tests/spartan6/bitstream_writer_test.cc b/lib/xilinx/tests/spartan6/bitstream_writer_test.cc
index 7331f59d..bb869ab1 100644
--- a/lib/xilinx/tests/spartan6/bitstream_writer_test.cc
+++ b/lib/xilinx/tests/spartan6/bitstream_writer_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <array>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/block_type_test.cc b/lib/xilinx/tests/spartan6/block_type_test.cc
index 47962427..f764d023 100644
--- a/lib/xilinx/tests/spartan6/block_type_test.cc
+++ b/lib/xilinx/tests/spartan6/block_type_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/block_type.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/configuration_bus_test.cc b/lib/xilinx/tests/spartan6/configuration_bus_test.cc
index 61f1a49a..04834a85 100644
--- a/lib/xilinx/tests/spartan6/configuration_bus_test.cc
+++ b/lib/xilinx/tests/spartan6/configuration_bus_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_bus.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/configuration_column_test.cc b/lib/xilinx/tests/spartan6/configuration_column_test.cc
index 8b2b48df..229322bf 100644
--- a/lib/xilinx/tests/spartan6/configuration_column_test.cc
+++ b/lib/xilinx/tests/spartan6/configuration_column_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_column.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/configuration_packet_test.cc b/lib/xilinx/tests/spartan6/configuration_packet_test.cc
index 1a132671..5494bd8c 100644
--- a/lib/xilinx/tests/spartan6/configuration_packet_test.cc
+++ b/lib/xilinx/tests/spartan6/configuration_packet_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <functional>
 
 #include <absl/meta/type_traits.h>
diff --git a/lib/xilinx/tests/spartan6/configuration_test.cc b/lib/xilinx/tests/spartan6/configuration_test.cc
index c8ee77fa..52243819 100644
--- a/lib/xilinx/tests/spartan6/configuration_test.cc
+++ b/lib/xilinx/tests/spartan6/configuration_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <cstdint>
 #include <iostream>
 #include <vector>
diff --git a/lib/xilinx/tests/spartan6/frame_address_test.cc b/lib/xilinx/tests/spartan6/frame_address_test.cc
index 4633c208..697e81b1 100644
--- a/lib/xilinx/tests/spartan6/frame_address_test.cc
+++ b/lib/xilinx/tests/spartan6/frame_address_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/frame_address.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/frames_test.cc b/lib/xilinx/tests/spartan6/frames_test.cc
index eec07507..d7494472 100644
--- a/lib/xilinx/tests/spartan6/frames_test.cc
+++ b/lib/xilinx/tests/spartan6/frames_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <vector>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/global_clock_region_test.cc b/lib/xilinx/tests/spartan6/global_clock_region_test.cc
index b38e11a4..7c79fe72 100644
--- a/lib/xilinx/tests/spartan6/global_clock_region_test.cc
+++ b/lib/xilinx/tests/spartan6/global_clock_region_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/global_clock_region.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/part_test.cc b/lib/xilinx/tests/spartan6/part_test.cc
index 83939d29..49ea8fb1 100644
--- a/lib/xilinx/tests/spartan6/part_test.cc
+++ b/lib/xilinx/tests/spartan6/part_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/part.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/spartan6/row_test.cc b/lib/xilinx/tests/spartan6/row_test.cc
index 735bc1d2..92a870d8 100644
--- a/lib/xilinx/tests/spartan6/row_test.cc
+++ b/lib/xilinx/tests/spartan6/row_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/spartan6/configuration_row.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/bitstream_reader_test.cc b/lib/xilinx/tests/xc7series/bitstream_reader_test.cc
index df576ca5..409ebb34 100644
--- a/lib/xilinx/tests/xc7series/bitstream_reader_test.cc
+++ b/lib/xilinx/tests/xc7series/bitstream_reader_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <array>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/bitstream_writer_test.cc b/lib/xilinx/tests/xc7series/bitstream_writer_test.cc
index 031540d5..f17ad62f 100644
--- a/lib/xilinx/tests/xc7series/bitstream_writer_test.cc
+++ b/lib/xilinx/tests/xc7series/bitstream_writer_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <array>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/block_type_test.cc b/lib/xilinx/tests/xc7series/block_type_test.cc
index 6fc8ecc9..643e90b9 100644
--- a/lib/xilinx/tests/xc7series/block_type_test.cc
+++ b/lib/xilinx/tests/xc7series/block_type_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/block_type.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/configuration_bus_test.cc b/lib/xilinx/tests/xc7series/configuration_bus_test.cc
index c665d9df..c58848ba 100644
--- a/lib/xilinx/tests/xc7series/configuration_bus_test.cc
+++ b/lib/xilinx/tests/xc7series/configuration_bus_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_bus.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/configuration_column_test.cc b/lib/xilinx/tests/xc7series/configuration_column_test.cc
index 49f49207..b2d2ca30 100644
--- a/lib/xilinx/tests/xc7series/configuration_column_test.cc
+++ b/lib/xilinx/tests/xc7series/configuration_column_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_column.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/configuration_packet_test.cc b/lib/xilinx/tests/xc7series/configuration_packet_test.cc
index 1658f142..d2244504 100644
--- a/lib/xilinx/tests/xc7series/configuration_packet_test.cc
+++ b/lib/xilinx/tests/xc7series/configuration_packet_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <functional>
 
 #include <absl/meta/type_traits.h>
diff --git a/lib/xilinx/tests/xc7series/configuration_test.cc b/lib/xilinx/tests/xc7series/configuration_test.cc
index 0c27d58b..12917786 100644
--- a/lib/xilinx/tests/xc7series/configuration_test.cc
+++ b/lib/xilinx/tests/xc7series/configuration_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <cstdint>
 #include <iostream>
 #include <vector>
diff --git a/lib/xilinx/tests/xc7series/crc_test.cc b/lib/xilinx/tests/xc7series/crc_test.cc
index 6a711356..5b9f97bf 100644
--- a/lib/xilinx/tests/xc7series/crc_test.cc
+++ b/lib/xilinx/tests/xc7series/crc_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/crc.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/ecc_test.cc b/lib/xilinx/tests/xc7series/ecc_test.cc
index eb3b4da1..f2ed099d 100644
--- a/lib/xilinx/tests/xc7series/ecc_test.cc
+++ b/lib/xilinx/tests/xc7series/ecc_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/ecc.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/frame_address_test.cc b/lib/xilinx/tests/xc7series/frame_address_test.cc
index 70c1f593..5680526f 100644
--- a/lib/xilinx/tests/xc7series/frame_address_test.cc
+++ b/lib/xilinx/tests/xc7series/frame_address_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/frame_address.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/frames_test.cc b/lib/xilinx/tests/xc7series/frames_test.cc
index 3cf4525b..8b0f04ec 100644
--- a/lib/xilinx/tests/xc7series/frames_test.cc
+++ b/lib/xilinx/tests/xc7series/frames_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <vector>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/global_clock_region_test.cc b/lib/xilinx/tests/xc7series/global_clock_region_test.cc
index 45978938..1ce55a69 100644
--- a/lib/xilinx/tests/xc7series/global_clock_region_test.cc
+++ b/lib/xilinx/tests/xc7series/global_clock_region_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/global_clock_region.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/part_test.cc b/lib/xilinx/tests/xc7series/part_test.cc
index 16b7e99c..7a7a4bfd 100644
--- a/lib/xilinx/tests/xc7series/part_test.cc
+++ b/lib/xilinx/tests/xc7series/part_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/part.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/tests/xc7series/row_test.cc b/lib/xilinx/tests/xc7series/row_test.cc
index e8f73180..ee88004f 100644
--- a/lib/xilinx/tests/xc7series/row_test.cc
+++ b/lib/xilinx/tests/xc7series/row_test.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_row.h>
 
 #include <gtest/gtest.h>
diff --git a/lib/xilinx/xc7series/block_type.cc b/lib/xilinx/xc7series/block_type.cc
index d74537f2..8a20aa19 100644
--- a/lib/xilinx/xc7series/block_type.cc
+++ b/lib/xilinx/xc7series/block_type.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/block_type.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/xc7series/configuration_bus.cc b/lib/xilinx/xc7series/configuration_bus.cc
index e0a2105d..a479662b 100644
--- a/lib/xilinx/xc7series/configuration_bus.cc
+++ b/lib/xilinx/xc7series/configuration_bus.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_bus.h>
 
 #include <iostream>
diff --git a/lib/xilinx/xc7series/configuration_column.cc b/lib/xilinx/xc7series/configuration_column.cc
index f9793839..a77f2e73 100644
--- a/lib/xilinx/xc7series/configuration_column.cc
+++ b/lib/xilinx/xc7series/configuration_column.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_column.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/xc7series/configuration_row.cc b/lib/xilinx/xc7series/configuration_row.cc
index 39ef9f4f..2a168911 100644
--- a/lib/xilinx/xc7series/configuration_row.cc
+++ b/lib/xilinx/xc7series/configuration_row.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/configuration_row.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/xc7series/ecc.cc b/lib/xilinx/xc7series/ecc.cc
index a3a5cb22..1b24a46c 100644
--- a/lib/xilinx/xc7series/ecc.cc
+++ b/lib/xilinx/xc7series/ecc.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/ecc.h>
 #include <cassert>
 #include <cstdio>
diff --git a/lib/xilinx/xc7series/frame_address.cc b/lib/xilinx/xc7series/frame_address.cc
index a4ae2585..c76b2af8 100644
--- a/lib/xilinx/xc7series/frame_address.cc
+++ b/lib/xilinx/xc7series/frame_address.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/frame_address.h>
 
 #include <iomanip>
diff --git a/lib/xilinx/xc7series/global_clock_region.cc b/lib/xilinx/xc7series/global_clock_region.cc
index 638cb461..6a025f1e 100644
--- a/lib/xilinx/xc7series/global_clock_region.cc
+++ b/lib/xilinx/xc7series/global_clock_region.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/global_clock_region.h>
 
 namespace prjxray {
diff --git a/lib/xilinx/xc7series/part.cc b/lib/xilinx/xc7series/part.cc
index 6bfd139e..549e3363 100644
--- a/lib/xilinx/xc7series/part.cc
+++ b/lib/xilinx/xc7series/part.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <prjxray/xilinx/xc7series/part.h>
 
 #include <iomanip>
diff --git a/tools/bitread.cc b/tools/bitread.cc
index 9cc7d06f..f5aa7e06 100644
--- a/tools/bitread.cc
+++ b/tools/bitread.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/tools/bittool.cc b/tools/bittool.cc
index 66d8a481..1f2c61a5 100644
--- a/tools/bittool.cc
+++ b/tools/bittool.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <algorithm>
 #include <iostream>
 #include <typeinfo>
diff --git a/tools/frame_address_decoder.cc b/tools/frame_address_decoder.cc
index b3c21e97..cc7a2031 100644
--- a/tools/frame_address_decoder.cc
+++ b/tools/frame_address_decoder.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <fstream>
 #include <iomanip>
 #include <iostream>
diff --git a/tools/gen_part_base_yaml.cc b/tools/gen_part_base_yaml.cc
index e5f965f2..77b9cdb0 100644
--- a/tools/gen_part_base_yaml.cc
+++ b/tools/gen_part_base_yaml.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <libgen.h>
 
 #include <algorithm>
diff --git a/tools/segmatch.cc b/tools/segmatch.cc
index 128bca65..1af59cdd 100644
--- a/tools/segmatch.cc
+++ b/tools/segmatch.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <assert.h>
 #include <stdint.h>
 #include <stdio.h>
diff --git a/tools/xc7frames2bit.cc b/tools/xc7frames2bit.cc
index 28d952d0..78863019 100644
--- a/tools/xc7frames2bit.cc
+++ b/tools/xc7frames2bit.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <iostream>
 
 #include <gflags/gflags.h>
diff --git a/tools/xc7patch.cc b/tools/xc7patch.cc
index 369ddac9..c4aa96f2 100644
--- a/tools/xc7patch.cc
+++ b/tools/xc7patch.cc
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2017-2020  The Project X-Ray Authors.
+ *
+ * Use of this source code is governed by a ISC-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/ISC
+ *
+ * SPDX-License-Identifier: ISC
+ */
 #include <iostream>
 
 #include <gflags/gflags.h>