alt Hacker NewsSorry, SM-4 not SM-1, was a full emulation of 11/40, with UNIBUS, and all. There were DEC copyright strings latent in some system files. It was a pretty good copy, but quite unreliable, and the reason was quite pedestrian---the connectors! It was a good lesson on how the entire technology chain needs to be high quality for the final product to work well.
Another example I forgot: the first Soviet nuke was directly copied from the stolen Fat Man design. Of course later they did novel stuff, especially the fusion designs of Sacharov et al.
It is well known that KGB got hold of the Concorde blueprints, so yeah, not a direct copy but certainly a lot of influence in that design. Again. the details like engine performance made the difference: apparently Tu144 had to continuously use afterburners to stay supersonic. It was also quite unreliable---I've heard that towards its end of life it was just flying cargo and airmail.
The Concorde and the Tupolev both relied on afterburners, because they operated under similar design constraints -- the "western" jet engines in the Concorde were not that much better than what Soviet design bureaus could produce.
The Concorde was much smaller, and lacked one of the major innovations of the Tu-144 -- forward flap canards to improve handling on a larger jet.
Probably for the better. The Tupolev killed a lot of its passengers, and it was almost immediately withdrawn from service after the first few incidents. The Concorde, a simpler and smaller design, served for decades.