Not sure about the MP 2000 tapes in general, but I at least know the rights have ended up with Kapagama, a subsidiary of EMI France which itself is now under Universal. Some MP 2000 cues have been remastered and reissued under the Kosinus Archives label. They probably have at least a few of the original tapes lying around.
What many people don't know, is that this wasn't originally a library record - it was originally a commercial release, issued as "Giant" on Z Records. The original sleeve lists the personnel of the impressive 30+ member orchestra performing on here.
(See my transcription of this list on Discogs.)- Of course that's André Cecccarelli on drums!
Though absolutely
brilliant, I never quite understood how one would employ these 5+ min. long cues to library usage, and it sort of makes sense seeing as how that was never strictly the intention. The rear sleeve of the original MP 2000 library release hilariously attempts to break the dense, long compositions into ready-for-editing sections: