In zlib documentation i found this license in these two files:doc/rfc1951.txtdoc/rfc1952.txtCopyright: 1996, L.Peter DeutschPermission is granted to copy and distribute this document for anypurpose and without charge, including translations into otherlanguages and incorporation into compilations, provided that thecopyright notice and this notice are preserved, and that anysubstantive changes or deletions from the original are clearlymarked.I suppose it is a DFSG-compatible license ?Anyway i fail to find it elsewhere. Is this an original one ?