edA-qa mort-ora-y wrote:
Looking at the Bison project however I can find no mention of this special condition. My project would fall into the same category.
I found it, in some of the files is this comment:
/*As a special exception, when this file is copied by Bison into a Bison output file, you may use that output file without restriction. This special exception was added by the Free Software Foundation in version 1.24 of Bison.*/