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+
+SOFTWARE RIGHTS
+
+We reserve no LEGAL rights to the Purdue Compiler Construction Tool
+Set (PCCTS) -- PCCTS is in the public domain.  An individual or
+company may do whatever they wish with source code distributed with
+PCCTS or the code generated by PCCTS, including the incorporation of
+PCCTS, or its output, into commerical software.
+
+We encourage users to develop software with PCCTS.  However, we do ask
+that credit is given to us for developing PCCTS.  By "credit", we mean
+that if you incorporate our source code into one of your programs
+(commercial product, research project, or otherwise) that you
+acknowledge this fact somewhere in the documentation, research report,
+etc...  If you like PCCTS and have developed a nice tool with the
+output, please mention that you developed it using PCCTS.  In
+addition, we ask that this header remain intact in our source code.
+As long as these guidelines are kept, we expect to continue enhancing
+this system and expect to make other tools available as they are
+completed.
+
+ANTLR 1.33
+Terence Parr
+Parr Research Corporation
+with Purdue University and AHPCRC, University of Minnesota
+1989-1995