In zlib documentation i found this license in these two files: doc/rfc1951.txt doc/rfc1952.txt Copyright: 1996, L.Peter Deutsch 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.
I suppose it is a DFSG-compatible license ? Anyway i fail to find it elsewhere. Is this an original one ? Thanks, Jérémy

