Text can still be copied after setting PDF Protect to Content Copying: Not Allowed.
When I have PDF security set to Content Copying: Not Allowed in Acrobat DC but allow low-resolution printing, I can still copy text from the PDF in Apple Preview. If I also set printing to Not Allowed, then copying of text is disabled. It's a both or none situation. I need to allow low-resolution printing, but not allow content copying.
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Chuck Miller
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Jussi Nurminen commented
"Enable copying of text, images, and other contect" not checked, but copying is still possible.
In attached picture: last week feature worked (23th June 2019), but today it doesn't (27th June 2019).