I've changed the usage restrictions. It now reads:
This source code is copyright 1995 by Andrew Plotkin. It may be freely
copied and distributed. It may be freely used for anything in the
privacy of your own home. You may distribute derivative works based on
this source code, but only under these conditions:
1) you must give permission for said works to be copied and
distributed freely, *and*
2) you must make the source code of said works available to the
public under the same conditions as this source code.
Note that the MaxZip application is under much less restrictive
conditions than this source code! You don't need to publish source
code in order to make MaxZip stand-alone games, and your stand-alone
games need not be freeware.
(Since all ZIP derivatives that I've seen are freely distributable,
and just about all have free source code as well, this shouldn't cause
much fuss. Call it my small blow for keeping things the way they are.
In any case, nobody has asked me about creating any derivative works
so far, so it's pretty moot.)
--Z
"And Aholibamah bare Jeush, and Jaalam, and Korah: these were the borogoves..."