alt Hacker NewsGiven that that judgement was made in 1981, it's possible that the judges (who were likely a bunch of depression era old dudes) had zero knowledge or exposure, and had never even thought much about, personal video recording before a bunch of lawyers tried to explain it to them during the case.
We have see this happen repeatedly with modern tech cases.
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Even complete legal novices like me know about the Sony/Betamax case, FWIW. It would shock me if a judge ruling on copyright implications of a technology didn't know about it.
Judges asking things that are obvious to us make for great headlines and quotes, like "what is a website?" or "what is an API?" and "shows" how out of touch they are, but like a judge (trying to) define pornography, making sure the plaintiff, the defendant, and the judge are on the same page seems to me (I am not a lawyer) just good procedure. First everyone has to agree on what a website or an API is before passing judgment on legal matters concerning them that all parties will abide by.
I doubt that. Home video recording, while a new thing in 1981, was not substantially different from making personal mixtapes on tape from radio or vinyl records which had been popular for decades. My grandfather had dozens of 4 track mixtape reels he made in the 60s. You could even go further back and say it wasn't any different than taking a photo of artwork for personal use. You didn't have to be that young in 1981 to understand what home video recording is.