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When I open a pdf in notepad, I can see the that for password protected files, there is text like R/Encrypt . For normal file, this text is not present. Perhaps you can search for this string after reading the pdf binary.
When I open a pdf in notepad, I can see the that for password protected files, there is text like R/Encrypt . For normal file, this text is not present. Perhaps you can search for this string after reading the pdf binary.
