I notice that some of the metadata in the opf file of an epub does not get scrambled.
Code:
<dc:creator id="id">... ...</dc:creator>
<dc:identifier>isbn:...</dc:identifier>
<dc:identifier>google:...</dc:identifier>
<dc:identifier>goodreads:...</dc:identifier>
<dc:identifier>amazon:...</dc:identifier>
<dc:identifier>kobo:...</dc:identifier>
<dc:identifier>calibre:...</dc:identifier>
<dc:identifier>uuid:...-...-...-...-...</dc:identifier>
<dc:identifier id="uid">...</dc:identifier>
<dc:source id="src-id">urn:isbn:...</dc:source>
<dc:description>*removed*</dc:description>
<dc:publisher>... </dc:publisher>
I replaced the unscrambled data with periods myself. But post-scramble, the original data was still there. Maybe this is because it was info that had been inserted by Calibre actions generated by me, at least in some cases? More specifically, the identifiers came when I used the "Edit metadata" window to download the book's metadata
Anyway, I thought I'd point it out. Had I not looked within the file, I'd have unintentionally posted unscrambled identifying data.
I'd vote for scrambling the <dc:description> content instead of removing it, at least if the amount of work is not disproportional to the value of preserving that data.
No need for anyone to do any of this on my account, of course. Mainly I wanted to alert people that opf content may not get scrambled, so be aware.