alt Hacker NewsI'm sure it's not quite that simple. Only parts the parts of those knock-off works that aren't public domain could be copyrightable. If you only own the copyright to ten lines in a 10k line codebase, then it's probably fair use for someone else to just to take the whole thing.
Plus what if Anna Karenina was GPL?
Anna Karenina is public domain, assuming you’re talking about the original? If you translate it then maybe you could release it under GPL, but bit odd?