When an author signs a publication contract, insofar as it contains strict and traditional copyright notices, he is pretty much signing his life away. It used to be that the publisher would maintain control only so long as the book is in print. Today, with digital printing, this means forever: your lifetime plus 70 years.
There is apparently a club in Berlin, called Breipott which plays only music offered under terms of one of the Creative Commons licenses and including only licenses which fit the definition of free as in freedom software (so basically, the four freedoms).
They've just had a party on July 25 celebrating "the adaption of the latest CC-BY-SA (version 3.0) to the German jurisdiction".