diff --git a/lang/pc/libpc/atn.c b/lang/pc/libpc/atn.c
index c329ced3..2f88b978 100644
--- a/lang/pc/libpc/atn.c
+++ b/lang/pc/libpc/atn.c
@@ -1,22 +1,4 @@
 /* $Header$ */
-/*
- * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
- *
- *          This product is part of the Amsterdam Compiler Kit.
- *
- * Permission to use, sell, duplicate or disclose this software must be
- * obtained in writing. Requests for such permissions may be sent to
- *
- *      Dr. Andrew S. Tanenbaum
- *      Wiskundig Seminarium
- *      Vrije Universiteit
- *      Postbox 7161
- *      1007 MC Amsterdam
- *      The Netherlands
- *
- */
-
-/* Author: J.W. Stevenson */
 
 /*
 	floating-point arctangent
diff --git a/lang/pc/libpc/exp.c b/lang/pc/libpc/exp.c
index ac604a5c..8181f1a1 100644
--- a/lang/pc/libpc/exp.c
+++ b/lang/pc/libpc/exp.c
@@ -1,22 +1,4 @@
 /* $Header$ */
-/*
- * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
- *
- *          This product is part of the Amsterdam Compiler Kit.
- *
- * Permission to use, sell, duplicate or disclose this software must be
- * obtained in writing. Requests for such permissions may be sent to
- *
- *      Dr. Andrew S. Tanenbaum
- *      Wiskundig Seminarium
- *      Vrije Universiteit
- *      Postbox 7161
- *      1007 MC Amsterdam
- *      The Netherlands
- *
- */
-
-/* Author: J.W. Stevenson */
 
 #include	<pc_err.h>
 
diff --git a/lang/pc/libpc/log.c b/lang/pc/libpc/log.c
index 8ce22c3c..71aa2e6f 100644
--- a/lang/pc/libpc/log.c
+++ b/lang/pc/libpc/log.c
@@ -1,22 +1,4 @@
 /* $Header$ */
-/*
- * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
- *
- *          This product is part of the Amsterdam Compiler Kit.
- *
- * Permission to use, sell, duplicate or disclose this software must be
- * obtained in writing. Requests for such permissions may be sent to
- *
- *      Dr. Andrew S. Tanenbaum
- *      Wiskundig Seminarium
- *      Vrije Universiteit
- *      Postbox 7161
- *      1007 MC Amsterdam
- *      The Netherlands
- *
- */
-
-/* Author: J.W. Stevenson */
 
 #include	<pc_err.h>
 
diff --git a/lang/pc/libpc/sin.c b/lang/pc/libpc/sin.c
index b24e991a..d9817a71 100644
--- a/lang/pc/libpc/sin.c
+++ b/lang/pc/libpc/sin.c
@@ -1,22 +1,4 @@
 /* $Header$ */
-/*
- * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
- *
- *          This product is part of the Amsterdam Compiler Kit.
- *
- * Permission to use, sell, duplicate or disclose this software must be
- * obtained in writing. Requests for such permissions may be sent to
- *
- *      Dr. Andrew S. Tanenbaum
- *      Wiskundig Seminarium
- *      Vrije Universiteit
- *      Postbox 7161
- *      1007 MC Amsterdam
- *      The Netherlands
- *
- */
-
-/* Author: J.W. Stevenson */
 
 extern double	_fif();
 
diff --git a/lang/pc/libpc/sqt.c b/lang/pc/libpc/sqt.c
index a3f91e4f..49803aa2 100644
--- a/lang/pc/libpc/sqt.c
+++ b/lang/pc/libpc/sqt.c
@@ -1,22 +1,4 @@
 /* $Header$ */
-/*
- * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
- *
- *          This product is part of the Amsterdam Compiler Kit.
- *
- * Permission to use, sell, duplicate or disclose this software must be
- * obtained in writing. Requests for such permissions may be sent to
- *
- *      Dr. Andrew S. Tanenbaum
- *      Wiskundig Seminarium
- *      Vrije Universiteit
- *      Postbox 7161
- *      1007 MC Amsterdam
- *      The Netherlands
- *
- */
-
-/* Author: J.W. Stevenson */
 
 #include	<pc_err.h>