Harry, I disagree that DRM is required for commercial success in the eBook market. Given that the print publisher with the greatest commercial success in that market is Baen, which has a policy of actively fighting DRM, the linkage seems spurious.
What's needed to ensure commercial success in the market is a certain volume of sales. Baen gets that volume because they don't use DRM. Therefore I would say that not only is DRM not essential, but also that it's a detriment to the market as a whole.
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