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The '''Debian Free Software Guidelines (DFSG)''' are a part of the Debian Social Contract.
They describe a list of principles that define what is considered "free" in Debian, and that are to be met by a Debian system and all its components.
An incomplete list of DFSG-compatible licenses is available on the DFSG Licenses page.
Packaging Implications
Debian Policy § 6.8.8.2. Repackaged upstream source describes when and why Debian package maintainers are sometimes required to make changes to published source code to comply with the DFSG, in abeyance of our practice of shipping a pristine upstream source tarball.
The uscan and gbp-import-orig utilities (from the Debian devscripts and git-buildpackage packages, respectively) may be used to simplify and/or automate the process of creating DFSG-compliant source tarballs.