I was wondering what the wording of the notice would be. Will it be "I have received this notification of an accusation" or will it be "I agree that I have violated copyright and promise not to do it again"? If it's the latter, do they provide contact information to protest and get your Internet access back without "admitting" to the false positive?
If there isn't an easy appeal process then the system could be abused and anyone can make any accusation and push people to the five level. If a forum administrator were to get upset with someone, they could log their IP address and make repeated false copyright violation claims against the user to get them suspended.