For those of you interested in the debate about copyright protection for music (digital rights management, or DRM, as it’s called) here’s an interesting article from the industry point of view — and a lively discussion on the lively Slashdot forum (some contributions are more, er, erudite than others).Something I think hasn’t been thought through by either side on the debate is that once a product ceases to be purely the property of the holder — like a CD — then problems will occur. What happens if I want to sell the music I’ve downloaded via an online service using DRM? What happens when I want to sell software I’ve bought that uses an activation feature? In the old days I could just sell my CDs, or CD-ROMs, out of the trunk of my car.