boycotting, by not buying cd's is legal and will hurt them where they most care about, in their sales figures. dos, a denial of service attack is quit illegal, easily procecutable, and will only take down their web site for a few hours. i am sure they will notice your attack for little more time than it takes for them to send the server logs to their lawyer or to the fbi. it will cost you a whole lt more than it would ever cost them and they wouldn't be detered from their course of action by it.

so what i am saying is that your idea is about as useful a deterent as terrorism is to politics. all you would do is make them angry and focus their attention on you for awhile. in the end it would have accomplished nothing, their goals would still be the same.