<br><br>not all the BSD License are compatible with the GNU General Public License, and infact only the FreeBSD License is compatible with the GNU General Public License.<br><br>again, you have not specify, which license is used by postgreesql, to say BSD License has not sense.<br>
<br><a href="http://www.gnu.org/licenses/license-list.html#SoftwareLicenses">http://www.gnu.org/licenses/license-list.html#SoftwareLicenses</a><br><br><dl><dt><a id="ModifiedBSD" href="http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5">
Modified BSD license</a></dt><dd>
<p>(Note: on the preceding link, the modified BSD license is
listed in the <em>General</em> section.)</p>
<p>This is the original BSD license, modified by removal of the
advertising clause. It is a simple, permissive non-copyleft free
software license, compatible with the GNU GPL.</p>
<p>If you want a simple, permissive non-copyleft free software license,
the modified BSD license is a reasonable choice. However, it is risky
to recommend use of “the BSD license”, because confusion
could easily occur and lead to use of the flawed <a href="http://www.gnu.org/licenses/license-list.html#OriginalBSD"><em>original</em> BSD license</a>. To avoid this
risk, you can suggest the X11 license instead. The X11 license and the
revised BSD license are more or less equivalent.</p>
<p>This license is sometimes referred to as the 3-clause BSD license.
</p></dd></dl><a id="clearbsd" href="http://labs.metacarta.com/license-explanation.html#license">The
Clear BSD License</a><dl><dd><p>This is a free software license, compatible with both GPLv2 and
GPLv3. It is based on the <a href="http://www.gnu.org/licenses/license-list.html#ModifiedBSD">modified BSD
license</a>, and adds a term expressly stating it does not grant
you any patent licenses. Because of this, we encourage you to be
careful about using software under this license; you should first
consider whether the licensor might want to sue you for patent
infringement. If the developer is disclaiming patent licenses to
set up a trap for you, it would be wise to avoid the
program.</p></dd></dl><dl><dt><a id="FreeBSD" href="http://www.freebsd.org/copyright/freebsd-license.html">FreeBSD license</a></dt><dd>
<p>This is the original BSD license with the advertising clause and
another clause removed. (It is also sometimes called the
“2-clause BSD license”.) It is a simple, permissive
non-copyleft free software license, compatible with the GNU GPL.</p>
<p>If you want a simple, permissive non-copyleft free software license,
the FreeBSD license is a reasonable choice. However, please don't call
it a “BSD” or “BSD-style” license, because that
is likely to cause confusion which could lead to use of the flawed <a href="http://www.gnu.org/licenses/license-list.html#OriginalBSD"><em>original</em> BSD license</a>.</p></dd></dl><dl><dd><br></dd><dt><a id="OriginalBSD" href="http://www.xfree86.org/3.3.6/COPYRIGHT2.html#6">
Original BSD license</a></dt><dd>
<p>(Note: on the preceding link, the original BSD license is listed in
the <em>UCB/LBL</em> section. This license is also sometimes called the
“4-clause BSD license”.)</p>
<p>This is a simple, permissive non-copyleft free software license with
a serious flaw: the “obnoxious BSD advertising clause”. The
flaw is not fatal; that is, it does not render the software non-free.
But it does cause <a href="http://www.gnu.org/philosophy/bsd.html">practical problems</a>,
including incompatibility with the GNU GPL.</p>
<p>We urge you not to use the original BSD license for software you
write. If you want to use a simple, permissive non-copyleft free
software license, it is much better to use the <a href="http://www.gnu.org/licenses/license-list.html#ModifiedBSD">modified BSD license</a> or the X11 license.
However, there is no reason not to use programs that have been released
under the original BSD license.</p></dd></dl>Please send FSF & GNU inquiries to
<a href="mailto:gnu@gnu.org"><em>gnu@gnu.org</em></a>.
There are also <a href="http://www.gnu.org/contact/">other ways to contact</a>
the FSF.
<br><p>
Please send broken links and other corrections or suggestions to
<a href="mailto:webmasters@gnu.org"><em>webmasters@gnu.org</em></a>.
</p>
<p>
Please see the
<a href="http://www.gnu.org/server/standards/README.translations.html">Translations
README</a> for information on coordinating and submitting
translations of this article.
</p>
<p>
Copyright © 2008 Free Software Foundation, Inc.
<br>
Verbatim copying and distribution of this entire article is
permitted in any medium without royalty provided this notice is
preserved.
</p>
Updated:
$Date: 2009/05/26 18:02:19 $<br><br>Examples of distributions GNU based on Debian, which hosts FreeBSD and NetBSD<br>in the project GNU, you can see: GNU/KFreeBSD and GNU/NetBSD<br>