Afternoon David - after much malarkey, I gave up trying to add the books. Obok didn't see any DRMs in those titles and they still will not 'add to library'.
Instead, I re-downloaded the various titles. I didn't realise this was possible, but it turns out that the Kobo Desktop program is, approximately, useless. I found that if I log into my account online there is an option to download each book, which I have done, and note that the file names are all different. I assume I messed something up somehow (??!) but the newly downloaded titles have all been absorbed into calibre okay.
However, I also downloaded several Open University titles (DRM free) from Amazon into the Kindle desktop (v1.17, or whatever is the best, old, version) as AZW files. But they will not convert or get sent to the Kobo: calibre says there is no suitable file format and that DRM is a problem. Obok does not see these as DRM files. I have dozens of AZW books converted to epub by calibre so have no idea what's going on here. (This DRM thing was also a problem with the old Kobo titles, before I re-downloaded them.)
Thanks again David. And, erm, sorry...
Chris
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