"On what legal basis?"
Actually, under the auspices of the Because Act, this is entirely legal. This little known piece of international legislation is, in fact, at the heart of many of the most prominent legal actions in the world today. Much loved by the RIAA, MPAA and the US due to it's implicit allowal for random search and seizure, legal 'fishing trips', non-judicially warranted wire taps, and it's espousal of 'guilty until proven guilty' legislature; the entire text of the Because Act has been reproduced below: -
Because Act
1. Because.
1.1. Just, because.
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