On Debian GNU/Linux systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'. 

 We reserve no legal rights to the ANTLR--it is fully in the public
 domain. An individual or company may do whatever they wish with source
 code distributed with ANTLR or the code generated by ANTLR, including
 the incorporation of ANTLR, or its output, into commercial software.
 .
 We encourage users to develop software with ANTLR. However, we do ask
 that credit is given to us for developing ANTLR. By "credit", we mean
 that if you use ANTLR or incorporate any 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 ANTLR and have developed a nice tool with the output,
 please mention that you developed it using ANTLR. In addition, we ask
 that the headers 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.
 .
 Terence Parr, jGuru.com