Last year, Belgian ISP Scarlet was ordered by a judge to begin blocking the transfer of copyrighted materials via peer-to-peer programs. After trying several methods, they are now asking the court to lift this order because they are technically unable to comply with the order.
They tried two systems: a system from Cisco for slowing down all P2P traffic, and a system from Audible Magic that is supposed to block all transfers of copyrighted materials. The Cisco system appeared to work, but caused lots of complaints and still allowed all transfers, and the Audible Magic system didn’t work at all:
Audible Magic said they had implemented this technique at Verizon and an asian ISP; when contacted, Verizon denied ever trying their technology, and Audible Magic refused to give the name of the asian ISP.