Error 29101 printing password protected PDF


I'm seeing this error when converting to PDF from Adobe Reader DC:

An error occurred: You have printed a password-protected PDF file and Ghostscript is not able to convert such files (29101).

However, converting the same PDF from SumatraPDF I am able to save the file correctly.
The PDF in question is NOT password protected.

What is the cause of this problem?



Password protected doesn't necessarily mean you need a password to open the PDF, it is enough if it finds a owner password (which is only needed to modify the PDF).
Adobe passes this information along to the printer, while Sumatra (and most other readers) don't. This causes Ghostscript to stop the conversion and return the error you have been getting.

Best regards