As far as I can see, there doesn’t seem to be any documentation available regarding OmniOutliner 5’s encrypted file format. It would be quite nice if OmniGroup would provide a Python implementation, as it does for OmniFocus.
Has any information been released on this yet? I’m wondering whether attachments to OmniOutliner Pro 5 files that have been encrypted with a password are themselves encrypted by virtue of having been attached/embedded in an outline file.