The U.S. Copyright group was using some kind of software where they would connect directly to people downloading / seeding the file to make sure they did in fact have the copyrighted material in question, and put a time stamp on it. Sounds like it is pretty fool proof, but that could just be all talk on their part. The trouble is even if a person tries to use that defense, they are going to have to spend the money to defend themselves in court. Most will just settle if it comes to that point.
As far as I know the wifi defense has never worked. I have heard of some regions talking about making having an unsecured wifi signal coming from your home a criminal offense.
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