On the Bits of Freedom website (Dutch language), an experiment was recently conducted. Some 'out of copyright' work (over 100 years old) was placed on a site. This was 'complained about' to the ISP by using hotmail addresses and claiming that the group owned the copyright. 7 of the 10 ISPs tested took down the site without question. One within three hours.
One ISP volunteered the personal details of the website owner despite this not being even asked for. The writeup is in English.