Actually, FreeBSD relied on a GPLed ypserv until Bill Paul finished
his version.  All of FreeBSD's yp code is under a BSD style copyright
now.

>FreeBSD uses a version written by Peter Eriksson <pem@signum.se> and 
>covered under the GNU license.  It's available from the FreeBSD source 
>tree, although I haven't tried it under NetBSD, it should work fine.
>
>---Jake

--
Justin T. Gibbs
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  FreeBSD: Turning PCs into workstations
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