I think the 48-hour DVD, and many restrictive forms of DRM, fail because they violate the trust relationship that is necessary for a consumer to fork over money for a product. When I buy something, I want to be sure that I will be able to enjoy it, legally, but without hassle.
For example, I once bought some songs from the Real.com store and after a while these songs (that I paid for) stopped playing on my computer for reasons unknown to me. I had to jump through a lot of hoops to "re-authorize" my computer. That really put me off and I never bothered with DRMed music again.
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I think the 48-hour DVD, and many restrictive forms of DRM, fail because they violate the trust relationship that is necessary for a consumer to fork over money for a product. When I buy something, I want to be sure that I will be able to enjoy it, legally, but without hassle. For example, I once bought some songs from the Real.com store and after a while these songs (that I paid for) stopped playing on my computer for reasons unknown to me. I had to jump through a lot of hoops to "re-authorize" my computer. That really put me off and I never bothered with DRMed music again.