Piracy is just the excuse. What they're saying is that Amazon will allow a collection of corporations (including Amazon) to decide what you're allowed to do with the hardware they pretended to let you buy.
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similarly I used to be able to download my kindle books and read them on non-kindle readers. Now you can't do it anymore. And some books seem to have further restrictions. I have had several phones and the kindle reader app has complained that I have reached sort of limit on the number of downloads some books have.