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ac(8) relicensed to a 2-clause BSD license

Hello NetBSD hackers,

As I was making some intrusive changes to the FreeBSD version of
ac(8), I noticed that it wasn't BSD licensed. After discussing this
with the original copyright holders, they agreed to relicense it under
a 2-clause BSD license.

The authors have also explicitly granted this right to other copies,
such as the version shipped with NetBSD. So if you want, you are
allowed to do this as well. I also saw NetBSD's version uses utmp,
even though NetBSD supports utmpx as well. If there's any interest in
porting ac(8) to utmpx, you are more than welcome to take a peek at
our version.

Happy hacking,
Ed Schouten <>

---------- Forwarded message ----------
From: Ed Schouten <>
Date: 2012/8/31
Subject: svn commit: r239954 - head/usr.sbin/ac

Author: ed
Date: Fri Aug 31 18:26:39 2012
New Revision: 239954

  Relicense ac(8).

  Though the license of the original ac(8) source code provides many
  liberties, we are already somewhat violating it. The license requires us
  to clearly comment any modifications to the source code, as the original
  authors of course do not want to get bug reports for modified versions
  of ac(8). This is something we have not done consistently.

  The need for such a license clause has become less over time. It is very
  unlikely that end users will contact the original authors, as the
  copyright is from 1994. I contacted both the copyright holders. They
  responded in a timely fashion and were more than willing to relicense it
  to a 2-clause BSD license. To address any concerns about bug reports
  going to the original authors instead of me, add my own name and email
  address to the copyright statements as well.

  MFC after:            1 month
  Special thanks to:    Christopher Demetriou and Simon Gerraty


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