[lodovic]

You could try a pair of noise cancelling speakers - not sure if that's enough to cancel out the speakers from a club though. On the other hand, if they already assaulted a policeman, be assured that the police will eventually be back.

[jdmoreira]

I think you are operating under the assumption that police is the same everywhere. The cops won't do anything here.

[btbuildem]

That doesn't work, it's an incredibly hard problem.

Whoever cracks it will be a very rich person.