The green ticks appear when a device is connected. They disappear when you eject the device. Your Sony books have no green ticks because your Sony is not connected.
It's completely normal.
Edit: as to DRM removal, you won't get any error messages unless you actually try to do something with the books (open them in the Calibre viewer, convert them, edit them in the editor etc.). Just importing the books or even editing metadata won't give you any DRM failure messages.
Last edited by Sirtel; 03-14-2021 at 10:45 AM.
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