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Take a look at the source files and you will see, if they are encrypted or not.
Make a copy of your epub, rename the file extension from epub to zip and extract this archive. Search for the content files, often with the extension .html or .xhtm and often in the subfolder "contents". Open one of these files with an editor. If you can see the HTML/XHTML source, then the file is not encrypted (without DRM). If there are only messy characters, then its encrypted.
Bye,
Dominik
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