If you read German, too, you might have seen yesterday’s post about recommendable newsletters for writers (here resp. at suite101). One of my recommendations was/is the website and the relating newsletter www.writing-world.com – and here is one of the reasons why: Let me direct you to this great article by Moira Allen of “Writing World” about various copyright questions:
You might want to keep in mind that this is an American website and that German law in general is not necessarily the same as in the US – but it might give you some information and food for thought. Enjoy!