To remove an encryption file from an EPUB, perform the following actions:
1. Change the file extension from “.epub” to “.zip”
2. Unzip the file
3. Look in the META-INF folder for a file called “encryption.xml”
4. Delete “encryption.xml”
5. Repackage the EPUB
a. Put the mime-type file into a zip archive using no compression
b. Add the OEBPS and META-INF folders to the “.zip” file
6. Change the file extension from “.zip” to “.epub
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