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zlib specification license



Hi,

Has this license been evaluated before?  RFC 1950-1952 contains:

   Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly

   Permission is granted to copy and distribute this document for any
   purpose and without charge, including translations into other
   languages and incorporation into compilations, provided that the
   copyright notice and this notice are preserved, and that any
   substantive changes or deletions from the original are clearly
   marked.

   A pointer to the latest version of this and related documentation in
   HTML format can be found at the URL
   <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.

The license initially doesn't give permissions to make modifications,
although it later require that any changes are clearly marked, which I
guess can be seen as the intention is to allow modifications.

Is the license DFSG-free?

/Simon


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