Why is csh `restricted'?

[Steven M. Schultz]

Warren -

> The csh was first released in 2bsd, and came with the copyright notice:

> /* Copyright (c) 1979 Regents of the University of California */
> /*
>  * C Shell
>  *
>  * Bill Joy, UC Berkeley
>  * October, 1978
>  */
> 	Csh sources are not public domain. If you do not have an AT&T V3.2
> 	source licence or better, you are stuck.
> 
> So, can anybody tell me if, when and how did the sources to csh become
> restricted, or if not, how this urban legend arose??

	It is not that they "became" restricted.  They always "were" restricted
	because they were derived from the original Bell Labs (later AT&T)
	sources (code borrowed from /bin/sh).  All UNIX sources were, up until 
	you negotiated the deal with SCO, restricted.

	For a long time you either had a multi-kilodollar source license
	or you didn't run UNIX at all.  The binary distributions came a bit
	later.  Initially when 'csh' was being written you had to have a
	source license.  Typically you'd pay (if memory serves) $25k or so
	(quite a chunk of cash in 1979) for a WesternElectric license, park
	the tapes in a rack and send a copy of the license and a check for a 
	few hundred dollars off to UCB to get the software you really intended 
	to run ;)

	You'll note that the copyright lacks the "may be redistributed ..."
	clauses that we typically associate with UCB software.  The famous
	UCB style of copyright ("copyrighted but redistributable") came
	later.

	Steven

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