If you don't own what's on your ebook, and don't even control what's on it, the potential for manipulation is immense.
I've been offered an ebook a while back but have not even bothered to try to use it.
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Oh - welcome back, De, thanks for the thoughtful diary! In the long run, we're all dead. John Maynard Keynes
It's certainly more worrisome for some texts than others. There's already been the case of a book being taken off the kindle by Amazon remotely from people that had already paid for it, because of a copyright fight. In the long run, we're all dead. John Maynard Keynes
That's what government is for.
Writing from the US, I must say you redouble the point of Jerome's concern, rather than qualifying it. The Fates are kind.