Most of the times this happens to me it says _all_ sideloaded epubs (well all the ones I check) are drm protected. Reboot fixes it. The most recent incident is the first time I recall seeing it claim just one file was. And "most of the times" is... you know... an average of about once a year? So it's a bit vexing but not a huge problem. It would be nice for it to stop happening, clearly,
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