I use calibre a lot. For transferring secure ePub, PDF, or LRX files, I still use the Sony library software. Before plugging in the Sony, make sure the Sony library's sync function is turned off. Import the ebooks you want to transfer to the Sony library software, then connect the Sony reader to the computer. Then drag and drop the ebooks into the Sony icon on the left panel. Doing these minimal steps will not mess up the collections that were set up under calibre. And I don't usually use Adobe DE for anything.
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