Back in the late '90s, I remember hearing an NPR story on a bill for copyright extension. Disney was terribly worried that their rights over the earliest Mickeys Mouse would be lost, so they were lobbying hard to extend. It went from 75 years to 99, and the great grandchildren of John Phillip Sousa breathed a huge sigh of relief than they would get to keep drawing royalties.
Patent, by contrast, is 17 years (last I heard) but there seems to be a way to buy a second term. If ARM were to allow the 64-bit patent to lapse, that would be in something like 6 years – which could be a reason Apple has not implemented SVE/SVE2.
Personally, I was pretty pissed off about that jpeg patent that someone found in the bottom drawer of a file cabinet from a company they had just bought. I think the law should require a patent/copyright holder to actively defend their IP or lose it outrightif they just let it run off-leash.