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I would add to ratinox's comments by pointing out that this is where Adobe also came unstuck. They succeeded once in forcing an upgrade on all customers but had to back down when they tried to do the same again. As a result their new "hardened" drm is now not so new but has still not achieved widespread adoption. Of course Adobe seemed to quickly realise that those wishing to remove drm are really very much a niche market and do not seem to have suffered materailly from the use of the tools. Even Amazon seems to be quite happy to allow DRM removal in most cases. My understanding is that whilst it upgrades K4PC aggressively it has made no attempt to stop downloads of azw3 and even mobi formats nor to enforce minimum versions of software/firmware outside of highly priced rental textbooks. Amazon largely seems to derive a little benefit by selling its books to those who want to read other than on an Amazon device.
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