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I haven't gotten around to looking at metadata with drm content yet. I've completed ereader input. Once I finish output I'm going to look into it a bit more.
What I've found so far is the pdb header can store the title. There can be metadata embedded in the content itself as a comment. There is a metadata section which contains null terminated strings.
The pdb header is not encrypted. What I still need to look into is if the first data section (it tells the section types) is encrypted and if the metadata section is encrypted.
Since you had mentioned that the metadata is pulled out of the files in your library before putting in the decryption key I'm assuming that at least the metadata section is not encrypted. If the first section is not encrypted it will make things much easier.
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