It's sufficient but not necessary. It would be better if there was an entity like the library of congress who would keep it safe, but private until copyright expired after which it would become public. Right now piracy leads to way more of free entertainment than preservation.

> Rightsholders must not be allowed to control how works are preserved, else they can very easily steal from the eventual public domain

I was clapping my hands at the skilfulness of this satire -- the idea that a person could actually believe this near-perfect inversion of reality, where piracy is not merely acceptable but in fact noble -- and then I started to think that... you actually probably do believe this.

If you were in fact trolling all along, my hat is off, you got me.

I think it's insane that the concept of a legal deposit [0] is so rarely extended to films or other media. Even more insane is that US courts have found it to be unconstitutional. A primary school's student newspaper needs to send two copies to the national library, while a movie can be played in every cinema in the nation and...nothing?? Let alone video games and other, more complicated media...

Everyone likes to shit on patents, but patents are designed well. You invent a thing and in exchange for publishing it openly, you get time-limited exclusive rights to it. Why the hell is copyright not like that?

[0] https://en.wikipedia.org/wiki/Legal_deposit

well maybe but they don't do a very good job at it

popular stuff that you could watch anywhere, you can pirate of course

but anything more obscure is impossible to find, or was there at one point but is now long gone