> You're talking about this package > http://packages.trisquel.info/slaine/doc/texinfo-doc-nonfree right? > Ubuntu put this package in universe (free software) for some reason, > which is probably how it ended up here.
See http://packages.trisquel.info/changelogs/pool/main/t/texinfo-doc-nonfree/texinfo-doc-nonfree_4.13a-1/texinfo-doc-nonfree.copyright for details: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with the Front-Cover texts being ``A GNU Manual,'' and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled ``GNU Free Documentation License.'' (a) The FSF's Back-Cover Text is: ``You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.'' The whole reason for Debian putting it in its nonfree repo are the Front-Cover and Back-Cover Texts stated above. http://www.gnu.org/distros/free-system-distribution-guidelines.html used by Trisquel requires being able to modify only "information for practical use", these cover texts aren't such. We can change the documentation to document modified versions of Texinfo, so it's not a problem. It would be nice to change package names to not call it nonfree, but it's not necessary.
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