I would be much easier. Every work that is extended would have to be registered, and it’s extension would be public record. There just needs to be a system whe

I would be much easier. Every work that is extended would have to be registered, and it’s extension would be public record. There just needs to be a system where it’s easy and free to check the extension status of a work. If it’s older than 5 years, and wasn’t registered or extended, then it’s public domain. If it was registered, then the registration website would tell you the expiration date, and when the next renewal date is. It would be about as hard as checking when a domain expires, which is much easier than the current system. Good luck figuring out who owns the copyright today on a random piece of text published 65 years ago.