Doesn't matter. The only thing copyright regulates is the duplication and spreading of copyrighted material. If you acquire "unlicensed" copies and learn from them, you have not violated copyright, you are not violating the author's copyright.
You seem to be arguing that downloading copyrighted material without permission is not copyright infringement. "Acquire 'unlicensed' copies" is exactly downloading without permission. You are making a copy, thus infringing on the author's copyright.