I don’t see what eligibility to have works protected has to do with legality of learning. I really hope “copyright can be used to prohibit reading and learning

I don’t see what eligibility to have works protected has to do with legality of learning. I really hope “copyright can be used to prohibit reading and learning” does not hold up in court. Copyright is, and should be, a protection from unauthorized reproduction. Extending it to protect the abstract ideas would be a disaster. And extending it to control stylistic learning would be even worse.