Editing IBM AIX (section)

== Source code ==
IBM made the AIX for RS/6000 source code available to customers for a fee; in 1991, IBM customers could order the AIX 3.0 source code for a one-time charge of US$60,000;<ref name=":0">{{Cite web |date=1991-07-02 |title=IBM AIX Version 3 Source Code For RISC System/6000 |type=Announcement letter |url=https://www.ibm.com/docs/en/announcements/archive/ENUS291-335 |access-date=2025-01-19 |website=www.ibm.com |language=en-US}}</ref> subsequently, IBM released the AIX 3.1 source code in 1992,<ref>{{Cite web |date=1992-01-21 |title=AIX Version 3.1 Source Code for RISC System/6000 |type=Announcement letter |url=https://www.ibm.com/docs/en/announcements/archive/ENUSZP92-0252 |access-date=2025-01-19 |website=www.ibm.com |language=en-US}}</ref> and AIX 3.2 in 1993.<ref>{{Cite web |date=1993-02-02 |title=AIX Version 3.2 Source Code for RISC System/6000 |type=Announcement letter |url=https://www.ibm.com/docs/en/announcements/archive/ENUSZP93-0158 |access-date=2025-01-19 |website=www.ibm.com |language=en-US}}</ref> These source code distributions exclude certain files (authored by third-parties) which IBM did not have rights to redistribute, and also exclude layered products such as the MS-DOS emulator and the C compiler. To license the AIX source code the customer first had to procure source code license agreements with AT&T and the [[University of California, Berkeley]].<ref name=":0" />