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Wikipedia shows Unix was first developed at the Bell Labs and later licensed to a few companies before its rights are finally sold to another company. What happened exactly with these licensing and purchasing? Today, which companies can legally produce and sell (genuine) Unix products?

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From the Wikipedia article you linked:

[...] the UNIX trademark passed to the industry standards consortium The Open Group, which allows the use of the mark for certified operating systems compliant with the Single UNIX Specification (SUS).

Thus, if you go to the effort[*] of getting your OS certified, you can call it "genuine Unix". A list is available in the Wikipedia article on SUS (https://en.wikipedia.org/wiki/Single_UNIX_Specification):

AIX, EulerOS, HP-UX, Inspur K-UX, macOS, Solaris, and z/OS.

Even more OSes were previously certified but haven't been re-certified to the latest version of the standard.

[*] - I expect you'll also have to contribute a few grand to The Open Group to cover the costs of them verifying your implementation.

  • AIX, Solaris and HP-UX are all commercial SysV variants. Any idea about how long they are certified to use the code from SysV? Do they pay an annual fee or have they purchased the rights permanently? – Cyker Dec 7 '16 at 5:33
  • They paid a one off fee for permanent rights for a particular release. – icarus Dec 7 '16 at 6:49

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