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ereaderundecided
They get that from Amazon, Google, Apple etc for 'everyone'. The don't need a Calibre backdoor, they can use the side doors in your OS, take a tour of your file system, download the calibre database and give to the new Eric Snowden for analysis and assessment - and he'll flog to the NYT and The Grauniad and then we'll all know what you've been reading
BR