You can't assert a copyright on a secret[1]. That's called a "trade secret", and those have no IP protection other than being able to sue the leaker if the secret gets out. You can't copyright facts, so implementing these "secrets" in computer code doesn't confer any kind of protection: the resulting code simply has regular copyright protection.

[1] Well, you can, but that just means other people can't copy it in its original form. AMD had authorized copies so they could write the code. The resulting code is not a copy of the secret document, it just uses facts from that document, and you can't copyright facts.

Similarly, if someone inside Coca-Cola shows you their master copy of the secret recipe for Coca-Cola, and you then write down a list of the ingredients and quantities and publish that on your blog, Coca-Cola can do nothing to you.