On Sun, 2003-08-03 at 11:36, Claus Färber wrote: > Of course, someone can add another invariant section to the manual. But > this is actually a licence change, possibly making the new version of > the manual non-free (although it still uses the GFDL as a template for > its licence). This problem, however, exists in many free software > licences such as the BSD licence, etc. If someone adds proprietary code to BSD-licensed code, however, you can later extract the free code (assuming you have access to the code of the now-proprietary program), and use it in something else. Once proprietary (invariant) sections are added to something under the GFDL, that version of the document is forever non-free, because they can't ever be removed. A nice example of a viral license. -- Joe Wreschnig <piman@debian.org>
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