Also sprach Aaron Smith (thespirit@smithcentral.net)
[License questions]
PostgreSQL is released under BSD License. This license say (informal,
IANAL) Do whatever you want with the code, but keep the author's
acknowledgements.
BSD licensed software is quite often incorporated into commercial
products, like FreeBSD, NetBSD, OpenBSD are used in Apple's Mac OS X,
OpenSSH in Cisco and Nokia products and so on.
However, PostgreSQL can't be bought, since it is no commercial product
like eg. MySQL or MS SQL Server. So get the source and do whatever you
want.
BTW: BSD license is not the only advantage of PostgreSQL, indeed it is
the world's most advanced database system and has a *lot* of technical
advantages other DBs are still dreaming of.
See http://en.wikipedia.org/wiki/BSD_license for a short summary of
the license. (Not that the original license only had 28 lines :-)
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Der Geist des Kriegers sollte mit Beginn des Neujahrstages bis zum Ende
des Jahres vom Gedanken an seinen Tod beherrscht werden.
Daijouji Shigesuke in "Budo Shoshin Shuu"