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Jason, I think you've made some very good points, but I also think Sony and Microsoft are interested in some kind of vendor lock-in, even though I agree that Mobipocket isn't. (So was Apple, no matter what Jobs is saying these days.) So I think it's fair to characterize one of the possible purposes of DRM as "vendor lock-in," depending on the vendor.
From the other side of the publishing fence, I think DRM vendors are quite interested in "vendor lock-in" or at least "vendor predominance" among publishers, who are, after all, the customers of the DRM vendors.
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