They do have that ability. They have that ability right now to put a digital lock on if they wish. However, if I am making a copy for the purposes of time- or format-shifting or backing up, I'm using it in a private sphere and I've paid once to get it into my home or my private sphere. As far as we're concerned, that artist has been compensated, so there's no need to ask for further compensation. TPMs will allow further compensation requests and raise the price of digital goods and content for consumers.
On February 29th, 2012. See this statement in context.