This is just my opinion Null. If you wish to spend time, money, and energy into an internet career, more power to you.
My perspective is that its very easy for someone not having their IP stolen to say that abusing IP is not an issue. If you don't think you are running a risk at being shutdown for IP abuse...you are fooling yourself. Its only going to get worse in the future. More and more companies are going to start clamping down, especially since capital investment of making AAA titles is getting so large.
All of us here are "prison lawyers". We have opinions but none of us are trained on IP laws. At the end of the day, none of us know exactly what we are talking about. If its a legal situation that involves your income, I highly suggest you take the time to talk to someone that actually is licensed and trained on this. Its no different than if you were facing a criminal investigation. It sounds to me that this is more than a hobby to you. If that is the case, treat it as such. If you are serious about LP's, you need to be proactive about your rights and protecting yourself.
Going with what DSP says and using his arguments...its never going to work in a court room setting.
My advice to you, and you can ignore this or whatever, is to lower the target on your back as much as possible. Don't use adsense and generate income through alternative means. Sell your own shit. Artwork, T-shirts, whatever. Make your own IP. Be different from the rank and file lazy LPers.