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The database is only part of a library. copying the metadata file is not sufficient, you need to copy the entire library folder. And make sure you dont use any multi library actions like copy to library or switching libraries. And if you want to do that, write a 5 line script to do it for you.
calibre itself is never going to be read-only (and note that even if it was read only you would still get database locked errors, since reading from a database will prevent other processes from writing to it).
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