At a rummage sale a few years ago, I bought a book published by Disney in the 1960s or 1970s which had instructions on how to make Mickey Mouse puppets. It also said to "have fun" making them. Selling things for a profit is a lot of fun. As far as I'm concerned, I now have a perpetual, transferable license to make and sell Mickey Mouse puppets. I even asked a lawyer.
This reminds me of a book called "numerical recipes in C", full of algorithms that were very useful except you couldn't really use them because the authors protected their use with a very restrictive license.
Nothing stopped you from implementing them yourself.