The UCB advertising clause has been rescinded by the copyright owner.
See this authorization.
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
The advertising clause is no longer required and is deleted. With all
of the usual cautions about IANAL I believe it is enough to delete
that clause from the copyright and reference that document.
Legally you can do that only for advertisements of UCB. If the
advertisements are for any other entity they cannot be removed.
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