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The public domain is kept waiting long enough for copyright to expire. Some people even think that copyright protection terms are too long right now. Making them perpetual by using trademarks as a substitute strategy to steal works from the public domain should be opposed vigorously by everyone interested in free culture, schrieb schon im Dezember 2003 LENZ über den Versuch,  Beethovens Elise als Klangmarke schützen zu lassen: Any lawyers out there considering humming Beethoven's tune at work will need to make sure nobody is listening now.  Materialien zum Thema auch in Netbib.