I recently dowladed PDF files I cannot enable the highlighter. Since it is a secured file I proceeded to print/save a PDF file which now allows me to enable the highlighter but I still cannot use it. Any ideas on how to workaround this?
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Thank you for your comments. Right, I cannot use the highlighter at all or add notes or comments. After I printed/saved to PDF I now can add notes, and I can enable the highlighter but still cannot use it.