diff --git a/COPYING b/COPYING
index 420af95c9..2b3425a52 100644
--- a/COPYING
+++ b/COPYING
@@ -55,14 +55,6 @@ GPLv2 or newer
 ngspice/src/frontend/numparam
 LGPLv2 or newer
 
-ngspice/src/ciderlib
-CIDER is distributed with its own license (see below) that is not compatible
-to DFSG (https://embedded.eecs.berkeley.edu/pubs/downloads/cider/index.htm).
-CIDER shall be covered New BSD according to UCB officials, but this
-re-licensing is still under discussion
-(see https://lists.debian.org/debian-legal/2016/10/msg00022.html).
-Therefore CIDER may not be made available in all software distributions.
-
 ngspice manual
 (see https://sourceforge.net/p/ngspice/ngspice-manuals/ci/master/tree/)
 Creative Commons Attribution Share-Alike (CC-BY-SA) v4.0
@@ -99,53 +91,6 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
 
 
----------------------------------- Cider -----------------------------------
-
-                    RESEARCH SOFTWARE AGREEMENT
-
-         This file specifies the terms under which the software and
-    documentation provided with this distribution are provided.
-
-         Software is distributed as is, completely without warranty
-    or service support.  The University of California and its employ-
-    ees are not liable for the condition or performance of the
-    software.
-
-         The University does not warrant that it owns the copyright
-    or other proprietary rights to all software and documentation
-    provided under this agreement, notwithstanding any copyright
-    notice, and shall not be liable for any infringement of copyright
-    or proprietary rights brought by third parties against the reci-
-    pient of the software and documentation provided under this
-    agreement.
-
-         THE UNIVERSITY OF CALIFORNIA HEREBY DISCLAIMS ALL IMPLIED
-    WARRANTIES, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY
-    AND FITNESS FOR A PARTICULAR PURPOSE.  THE UNIVERSITY IS NOT
-    LIABLE FOR ANY DAMAGES INCURRED BY THE RECIPIENT IN USE OF THE
-    SOFTWARE AND DOCUMENTATION, INCLUDING DIRECT, INDIRECT, SPECIAL,
-    INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
-
-         The University of California grants the recipient the right
-    to modify, copy, and redistribute the software and documentation,
-    both within the recipient's organization and externally, subject
-    to the following restrictions:
-
-
-    (a)  The recipient agrees not to charge for the University of
-         California code itself.  The recipient may, however, charge
-         for additions, extensions, or support.
-
-    (b)  In any product based on the software, the recipient agrees
-         to acknowledge the research group that developed the
-         software.  This acknowledgement shall appear in the product
-         documentation.
-
-    (c)  The recipient agrees to obey all U.S. Government restric-
-         tions governing redistribution or export of the software and
-         documentation.
-
-
 ---------------------------------- Xspice --------------------------------
 
 THE SOFTWARE PROGRAMS BELOW ARE IN THE PUBLIC DOMAIN AND ARE PROVIDED FREE OF