Net Hack General Public License
The NetHack General Public License is a copyleft software license primarily used by the roguelike game NetHack. It is certified as an open source license by the Open Source Initiative.
The license was written in 1989 by Mike Stephenson, who patterned it after the GNU bison license (which was written by Richard Stallman in 1988). Like the Bison license, and Stallman's later GNU General Public License, the NetHack license was written to allow the free sharing and modification of the source code under its protection. At the same time, the license explicitly states that the source code is not covered by any warranty, thus protecting the original authors from litigation.
Read more about Net Hack General Public License: Derivative Works
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“In communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticize after dinner, just as I have a mind, without ever becoming hunter, fisherman, shepherd or critic.”
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“Purchasing power is a license to purchase power.”
—Raoul Vaneigem (b. 1934)