Z:gnu-www-ja-gpl-2.0-faq--26db19-Meanwhile, the GFDL has clause/en

Meanwhile, the GFDL has clauses that help publishers of free manuals make a profit from selling copies&mdash;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 &ldquo;the standard&rdquo;.