(re: Ken: King’s Quest PCjr copyright owners) I remember that the IBM contract for the PCjr version of Kings Quest was very non-restrictive for Sierra. IBM didn’t ask for any exclusivity, or ownership of anything produced.
Times have changed, but at the time, IBM was in the position that Microsoft is today. Even more so. IBM was so dominant that there were lots of rumors that the courts would break them up, as had just been done to AT&T. In our agreement with IBM, they bent over backwards to make sure that the agreement was absolutely fair to Sierra.
It has been nearly 30 years since I saw the agreement, but I would be very surprised if IBM has any rights at all to the code. My guess is that Vivendi, and VU Games, have 100% ownership of the code, characters, plot, trademark, copyrights, etc.