All reports of license-problem-gfdl-non-official-text for the archive. The extended description of this tag is:
The given source file is licensed under GFDL, but using a non-official text for the "no invariant sections" part.
Please ask upstream to always use (case insensitive): with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
This tag has not been emitted in any package tested by Lintian.