Are any parts of UNIX in public domain?

[lars]

>
>In the context of this whole discussion about previous lack of copyright
>notices, it is interesting to note that EVERY piece of source code in the
>System V Release 2.1 source code option for the 3B2 has the following notice
>at the front of the file:
>
>/*	Copyright (c) 1984 AT&T	*/
>/*	  All Rights Reserved  	*/
>
>/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
>/*	The copyright notice above does not evidence any   	*/
>/*	actual or intended publication of such source code.	*/
>


It is interesting to notice that the previously very small (and fast)
shell procedure /bin/true now has a size of 747 bytes and a doubled
execution time.