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Originally Posted by aritza;
My fear is that this lack of portability of metadata has me tied to Calibre, which for all I know could stop being developed at any time (or could start charging money, maybe even a lot of money), or a product that better serves my needs could come around.
I don't see why I seem to be the only one concerned about this.
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The .opf file is in a XML format defined as part of the EPUB standard - probably the only one that is truly portable and open. Using this file to storeand transport metadata is the one that is most likely to protect you if you decide to switch away from Calibre.