I remember, in the 80's, Xenix was "export restricted", especially libc.a if it had "crypt.o" in it - like the algorithm hadn't been published many years prior to that. Anybody remember the big Toshiba machine-tool controller foorah that supposedly allowed the Soviets make quieter submarine propellers?
It wasn't just Xenix, it was about half of all the high-tech in existence. Those lists have always been a joke, both because they were totally out of touch with current technology, and because they seemed to have been generated by throwing darts at a Mouser catalogue. Back when it was still COCOM I once had to go through the IT section of the control lists, and found that something like a third of all the products sold in the computer store down the road were (in theory) export-controlled, things like "chips with more than 208 pins", a complex list of graphics performance that was leading-edge in the 1980s but was by the time the lists were published exceeded by anything faster than an S3 Trio64, anything that did adaptive routing which must have been high-tech in the 1970s some time but by the time it was featured on the control lists any Unix kernel and every router did it, and I can't remember all the other nonsense in there (Linux, even in the form it was in back then, had so much controlled technology in it you could practically open an arms fair with it). If the lists had been enforced as written, half the US computer industry would have had to stop all exports and/or been shut down as illegal arms traders. You just had to rely on the fact that they were never enforced unless you really pissed off the wrong people in the government, at which point they'd suddenly discover all sorts of violations that you'd committed.