Información
GNU Free Documentation License
Version 1.3, 3 November 2008
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Meanwhile, the GFDL has clauses that help publishers of free manuals make a profit from selling copies—cover texts, for instance. The special rules for Endorsements sections make it possible to use the GFDL for an official standard. This would permit modified versions, but they could not be labeled as “the standard”.
Using the GFDL, we permit changes in the text of a manual that covers its technical topic. It is important to be able to change the technical parts, because people who change a program ought to change the documentation to correspond. The freedom to do this is an ethical imperative.
Our manuals also include sections that state our political position about free software. We mark these as “invariant”, so that they cannot be changed or removed. The GFDL makes provisions for these “invariant sections”.
https://www.gnu.org/licenses/gpl-faq.html#WhyNotGPLForManuals
Invariant sections
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