For complete information about the PennMUSH copyright, see
hdrs/copyrite.h.

Here are a few frequently referenced tidbits from the file,
with explanations:

 * 2. Users of this software agree to make their best efforts (a) to return to
 * the above-mentioned authors any improvements or extensions that they make,
 * so that these may be included in future releases; and (b) to inform the
 * authors of noteworthy uses of this software.

The way this should work is that if you make an improvement
to the code (fix a bug, add an extension, or do something else nifty),
you should send the PennMUSH maintainer (dunemush@pennmush.org)
a description of your change. If I want to incorporate it into an
official release, I'll ask you to send a diff file.

You do not need to report simple cosmetic changes that you make
(e.g. now ' is say instead of ") or the addition of flags or
attributes which don't have any hardcoded effect on the MUSH
(e.g. I've created a FOOD flag which my softcoded hunger system
uses but which doesn't affect anything else.)

 * THIS CODE MAY NOT BE USED COMMERCIALLY WITHOUT PERMISSION.

This means exactly what it says. You may not charge people
to play your MUSH, and you may not sell the source code to
someone. Asking for donations for hardware or such things
is not charging players to play your MUSH, if the donation
is voluntary and not recompensed.