It all depends on what kind of license agreements you have actually agreed upon.
If you bought a Sony Playstation 3, agree to a license agreement that forbids you to set fire on it and then set fire to it.. well... you are breaking the agreement. I'm not sure if breaking an agreement would actually be illegal though, but it can have penalties.
If you have never agreed upon a license agreement that forbids you to set fire on it (you bought the PS3 and never turned it on), and then set fire to it.. i think you're pretty legal.
If you bought a Sony Playstation3, agree not to modificate it via a license agreement and then start hacking away.. well.. are you not breaking the agreement? But would that be against the law? There is no company in the world that can make you agree to something that is against local and international law rules you as a person are obliged to follow or can enjoy.
For instance: Sony could make me agree to set up a human slave trade business via an End User License Agreement, but it would be worthless, since it's against most laws.
That is the sole reason why this licensing business is a very shady business. It is almost impossible for an end user to understand the End User License agreement they are agreeing upon and it is very difficult to prove it abides every local law.