On December 19, a US Court of Appeals for the District of Columbia overturned a previous ruling by a trial judge ordering Verizon Communications to reveal the identity of an Internet subscriber suspected of illegally trading music recordings. On the same day, the Dutch Supreme Court ruled that makers of file-sharing software Kazaa cannot be held liable for copyright infringement of music or movies traded by its users.
In the US case, Verizon had appealed an…