BSD is a Unix operating system
AT&T's research division, Bell Labs, developed UNIX in 1969
UNIX was a research operating system, intended to drive innovation
AT&T licensed copies of UNIX to people
When you bought a UNIX license, you got the complete source code to the operating system, and full rights to use, modify the code and redistribute
The University of California, Berkeley bought a UNIX license
they then went about modifying it to suit their needs
They invented the Unix domain sockets (called Berkeley sockets, at the time), the TCP/IP stack, the init runlevel system, and a whole host of other things to enhance the operating system in a fully networked, multi-user environment
BSD is Unix
AIX is Unix
HP-UX is Unix
Solaris is Unix
Xenix is Unix
BSD was an original Unix derivative
Since BSD, and the other Unix derivatives mentioned above, first arrived, a few things have happened
- AT&T sold the rights of UNIX to the Santa Cruz Operation
- The Santa Cruz Operation then sold the rights to UNIX to Novell
- Novell then gave up the rights to UNIX, and transfered all rights & ownership over to the Open Group
With the UNIX rights and ownership now held by a non-profit organisation, UNIX is now open to other non-profit organisations and individuals
(no more licensing)
Free BSD, Open BSD & Net BSD are derived (at varying points) from BSD
The Mac OS X userland is lifted straight from Free BSD
The Mac OS X kernel is the Free BSD kernel (with a few bits & bobs added by Apple)
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