ZCODE Patch
-----------
This pair of programs is used to create and apply patches between different
versions of a given zcode file, in particular those from by Infocom.

encrypt takes two zcode files and creates a patch file, with syntax
encrypt from.z5 to.z5 from-to.pat

decrypt applies a patch, or gives information about a patch, with syntax
decrypt from-to.pat from.z5 to.z5
or
decrypt from-to.pat

In both of the above, the first two files are required and the last file
is created.

ZCODE-Patch was originally written by
Paul Gilbert (pfg@yallara.cs.rmit.edu.au),
however, his email now bounces, so the maintainership has been taken over
by Rodney Hester (rod3@mindspring.com) and
Nils Barth (nils_barth@post.harvard.edu)
These programs are
Copyright (c) 1997/98 Paul Gilbert,
with modifications
Copyright (c) 2000/2001 Rodney Hester and Nils Barth.
No clue about licensing -- it seems to be basically public domain,
but we'd need a statement from Paul to that effect.

Since there is no source repository, there is a patch attached
to revert the ZCODE-Patch 2.2 source to 2.1; apply by issuing:
patch -p1 < zcode-patch-2_2_to_2_1.patch
