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Amazon is making it impossible to remove the DRM from Kindle Books
(goodereader.com)
This is a most excellent place for technology news and articles.
I'll be switching to kobo next time round, but I've never not been able to dump books onto my kindle by usb. I do it with my phone over USB sometimes. Since when has not doing that been a thing?
Since at some point recently. You can still email files (epub not mobi now) to your kindle, but usb transfer doesn't work any more.
Have you got a link to more info about it? I can't find details anywhere.
Your "Send to Kindle" email address is in your profile details, under devices and apps. In the app (Android) it's under settings.
https://www.amazon.com/gp/sendtokindle
Sorry, I meant any more details about sending books to kindle via USB - I've never had any issue doing this.