I'd always assumed that they were licensed, but I'm not certain. IIRC, I only have a couple other Trip LPs -- a Woody Herman, originally Phillips, and one of Quincy's Mercury big band records. They struck me as sounding OK too. (Again, maybe not as good as the originals, but I'd always ascribed that to Trip's pressing and/or vinyl quality.)
bresna, one thing to consider: I don't consider myself an "audiophile," so that may color my perceptions. I have a solid analog set-up -- and old Rega Planar 3 'table with a Dynavector 10x4 cartridge and an NAD pre-amp -- but I try my best to not focus on sound per se. I really don't like futzing around with audio gear (or comparing versions of recordings). Most of my audio equipment is relatively old -- because once I find something that I'm happy with I don't want to mess with it.
Also, my 51-year-old ears ain't what they used to be! My hearing is at the very bottom of the "normal" range, and I expect that I'll be using hearing aids at some point in the future. So take all that I'm saying with regards to sound with a grain of salt.
If you're using an 8-track to determine the audio quality of ANYTHING, that is NOT a good sign!