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ANTLR-PD with fallback
ANTLR Software Rights Notice with license fallback
Per SPDX.org, ANTLR used this public domain notice through version 2.7 and
then switched to a BSD license for version 3.0 and later.
ANTLR 2 License
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 commerical 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.
In countries where the Public Domain status of the work may not be valid, the
author grants a copyright licence to the general public to deal in the work
without restriction and permission to sublicence derivates under the terms of
any (OSI approved) Open Source licence.