diff --git a/src/include/ngspice/loopdefs.h b/src/include/ngspice/loopdefs.h
index cfb7d42f6..ec7abbda7 100644
--- a/src/include/ngspice/loopdefs.h
+++ b/src/include/ngspice/loopdefs.h
@@ -1,12 +1,32 @@
-/**********
-Copyright 1990 Regents of the University of California.  All rights reserved.
-Author: 1988 Jaijeet S Roychowdhury
-Modified: 2000 AlansFixes
-
-Copyright 2020 Anamosic Ballenegger Design.  All rights reserved.
-Author: 2020 Florian Ballenegger
-
-**********/
+/*******************************************************************************
+ * Copyright 2020 Florian Ballenegger, Anamosic Ballenegger Design
+ *******************************************************************************
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
 
 #ifndef ngspice_LOOPDEF_H
 #define ngspice_LOOPDEF_H
diff --git a/src/spicelib/analysis/loopan.c b/src/spicelib/analysis/loopan.c
index ba1a37d3d..2555cabb5 100644
--- a/src/spicelib/analysis/loopan.c
+++ b/src/spicelib/analysis/loopan.c
@@ -1,7 +1,33 @@
-/**********
-Copyright 2020 Anamosic Ballenegger Design.  All rights reserved.
-Author: 2020 Florian Ballenegger
-**********/
+/*******************************************************************************
+ * Copyright 2020 Florian Ballenegger, Anamosic Ballenegger Design
+ *******************************************************************************
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
+
 
 #include "ngspice/ngspice.h"
 #include "ngspice/cktdefs.h"
diff --git a/src/spicelib/analysis/loopaskq.c b/src/spicelib/analysis/loopaskq.c
index b53e5ad7c..5567e4c3a 100644
--- a/src/spicelib/analysis/loopaskq.c
+++ b/src/spicelib/analysis/loopaskq.c
@@ -1,10 +1,33 @@
-/**********
-Copyright 1990 Regents of the University of California.  All rights reserved.
-Author: 1988 Jaijeet S Roychowdhury
+/*******************************************************************************
+ * Copyright 2020 Florian Ballenegger, Anamosic Ballenegger Design
+ *******************************************************************************
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
 
-Copyright 2020 Anamosic Ballenegger Design.  All rights reserved.
-Author: 2020 Florian Ballenegger
-**********/
 
 #include "ngspice/ngspice.h"
 #include "ngspice/ifsim.h"
diff --git a/src/spicelib/analysis/loopsetp.c b/src/spicelib/analysis/loopsetp.c
index e30cf16b2..33cc8ee62 100644
--- a/src/spicelib/analysis/loopsetp.c
+++ b/src/spicelib/analysis/loopsetp.c
@@ -1,10 +1,32 @@
-/**********
-Copyright 1990 Regents of the University of California.  All rights reserved.
-Author: 1988 Jaijeet S Roychowdhury
-
-Copyright 2020 Anamosic Ballenegger Design.  All rights reserved.
-Author: 2020 Florian Ballenegger
-**********/
+/*******************************************************************************
+ * Copyright 2020 Florian Ballenegger, Anamosic Ballenegger Design
+ *******************************************************************************
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
 
 #include "ngspice/ngspice.h"
 #include "ngspice/ifsim.h"
@@ -14,8 +36,6 @@ Author: 2020 Florian Ballenegger
 
 #include "analysis.h"
 
-/* .loop output insrc loopbreakpoint dec/oct/lin n fstart fstop */
-
 int 
 LOOPsetParm(CKTcircuit *ckt, JOB *anal, int which, IFvalue *value)
 {