You can still read and learn from something patented. That is, after all, the whole point of a patent! You can also read and learn from copyleft and use that l

You can still read and learn from something patented. That is, after all, the whole point of a patent! You can also read and learn from copyleft and use that learning elsewhere. Remember, copyright does not apply to ideas. It applies to a specific individual instantiation. In theory.