calibre can convert from azw3, proprietary format means nothing.
Now, if you mean they are locked with DRM, then that's another story. calibre cannot convert an azw3 it is incapable of reading, and it doesn't have a decryption module provided by amazon such that calibre is an authorized Kindle App.
Assuming that's what you mean, I suggest you google Apprentice Alf and fix that immediately.
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