The DRM vendors are in the business of selling the illusion of protection. As long as that perceived value is in place and they are collecting their percentage of each sale, they don't care.
They understand how the technology works and they know that if they change the DRM technology it will just get cracked again. For them to update the technology is very costly. For each crack they have to evaluate what it would take to fix, how disruptive it would be for the users and the negative publicity they would receive. It would also make them a target for the next crack because of the negative publicity. I'm sure they've evaluated all those things and decided the best action is to do nothing.
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