Download ${Unix_Tools} - The Computer Laboratory

Free software license concepts
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public domain: authors waive all copyright
“MIT/BSD” licences: allow you to copy, redistribute and modify
the software in any way as long as
• you respect the identity and rights of the author
(preserve copyright notice and licence terms in source code and
documentation)
• you agree not sue the author over software quality
(accept exclusion of liability and warranty)
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GNU General Public Licence (GPL): requires in addition that any
derived work distributed or published
• must be licensed under the terms of the GPL
• must have its source code made publicly available
Numerous refinements and variants of these licences have been written. For more information on
the various opensource licence types and their philosophies: http://opensource.org/
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Original Unix user interfaces
The initial I/O devices were teletype terminals . . .
Photo: Bell Labs
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