Forcing them to sell you a transferable version seems reasonable, but I still disagree. First, forcing them to sell you something is meaningless unless you force them to sell it to you at a reasonable price, so you plan requires price fixing. Second, collusion is already illegal. Finally, I don't see the danger.
This is already quickly becoming the case for video games and has been great for the industry, both developer and consumer.
Different companies can use the same format without colluding. Are you suggesting that in a competitive environment content companies could not afford to anger their customer buy using DRM? These companies believe that they would lose more sales by not having DRM than by having it. Look at GoG vs Steam. GoG gets some bonus points for not having DRM, but having DRM doesn't seem to costing Steam too many sales.
