You seem to completely misunderstand copyright. You cannot copyright information or knowledge, all you can copyright is your communication of that information and knowledge. You can write a book about communication protocols, and I can read your book and write my own based on what I learned from yours, and there's nothing you can do about it. I have not infringed your copyright, I have not copied your work, I have created a new work and possibly, if I've learned from others as well or discovered something in my studies, I can use that for improving on your information. And your assertion that I can't use the information is brain-dead stupid -- you think that people who check a book about how to win a game out of the library, read it, and use that new knowledge to win are infringing copyright???
Without copyright, any rich bastard could sell as many copies of my book as he wanted, he has marketing bucks and I don't. I would get nothing for my work, the publisher would reap the rewards.
That said, copyright lengths are absurd. There is no way Jimi Hendrix will ever be talked into recording any more records.
As to patents, there should be a patent system but ours is screwed for many different reasons.
Trademarks? You think it should be OK for me to open a McDonald's restaraunt down to the golden arches?