It looks like, if this goes ahead, everyone will start needing to add certain words to any e-mail they send or message they post online - bomb, terrorist, jihad, free download, piracy and the like. Simply to render the system completely useless so they say "Know what? Forget it. It was a dumb idea anyway."
Although, that being said, if a computer does simply filter for keywords, another option is "don't talk about illegal activity". But seeing as this has little chance of actually preventing crime, I am opposed to this breach of human rights, so fully endorse non-criminal tactics used to screw the system up.