Authors of GNU Bison.

Bison was written primarily by Robert Corbett.

Richard Stallman made it Yacc-compatible.

Wilfred Hansen of Carnegie Mellon University added multicharacter
string literals and other features.

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Copyright (C) 1998-2012 Free Software Foundation, Inc.

This file is part of Bison, the GNU Compiler Compiler.

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.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.