diff --git a/mac-cpp-source/utils/pstring.cpp b/mac-cpp-source/utils/pstring.cpp
index a7ef5e6..0873d19 100644
--- a/mac-cpp-source/utils/pstring.cpp
+++ b/mac-cpp-source/utils/pstring.cpp
@@ -1,16 +1,19 @@
-/************************************************************
-
-    pstring.c
-
-       AUTHOR: Marcio Luis Teixeira
-       CREATED: 9/17/94
-
-       LAST REVISION: 11/25/21
-
-       (c) 1994-1995 by Marcio Luis Teixeira.
-       All rights reserved.
-
-*************************************************************/
+/****************************************************************************
+ *   Common Libraries (c) 1994 Marcio Teixeira                              *
+ *                                                                          *
+ *   This program is free software: you can redistribute it and/or modify   *
+ *   it under the terms of the GNU General Public License as published by   *
+ *   the Free Software Foundation, either version 3 of the License, or      *
+ *   (at your option) any later version.                                    *
+ *                                                                          *
+ *   This program is distributed in the hope that it will be useful,        *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU General Public License for more details.                           *
+ *                                                                          *
+ *   To view a copy of the GNU General Public License, go to the following  *
+ *   location: <http://www.gnu.org/licenses/>.                              *
+ ****************************************************************************/
 
 #include "pstring.h"
 #include <ctype.h>
diff --git a/mac-cpp-source/utils/pstring.h b/mac-cpp-source/utils/pstring.h
index d0ccfeb..dd1aa45 100644
--- a/mac-cpp-source/utils/pstring.h
+++ b/mac-cpp-source/utils/pstring.h
@@ -1,16 +1,19 @@
-/************************************************************
-
-    pstring.h
-   
-       AUTHOR: Marcio Luis Teixeira
-       CREATED: 9/17/94
-       
-       LAST REVISION: 11/25/21
-       
-       (c) 1994-1995 by Marcio Luis Teixeira.
-       All rights reserved.
-  
-*************************************************************/
+/****************************************************************************
+ *   Common Libraries (c) 1994 Marcio Teixeira                              *
+ *                                                                          *
+ *   This program is free software: you can redistribute it and/or modify   *
+ *   it under the terms of the GNU General Public License as published by   *
+ *   the Free Software Foundation, either version 3 of the License, or      *
+ *   (at your option) any later version.                                    *
+ *                                                                          *
+ *   This program is distributed in the hope that it will be useful,        *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU General Public License for more details.                           *
+ *                                                                          *
+ *   To view a copy of the GNU General Public License, go to the following  *
+ *   location: <http://www.gnu.org/licenses/>.                              *
+ ****************************************************************************/
 
 short           pstrlen( unsigned char *str );
 void            psetlen( unsigned char *str, short len );