[Question]:Question about bison adding GPL copyright to the parser files generated by bison and yacc.c

[bird bravo]

Dear bison maintainer:

    I noticed that when I use bison and the parser skeleton(yacc.c) to
generate a parser file... there will be a copyright notice to claim the
file is a GPLV3 and an exception declaration... I wanna know is that OK to
use and distribute the parser file as I wish..

Forgive about my ignorance and wish to get ur  reply soon...

Best wishes ^-^