As the title says I found a particular pdf in wich okular's review function is not working. Whenever I press F the review menu doesn't show, and by trying to access it via tools -> menu it looks like the function is disabled. Why does this happen in a particular pdf (all other pdfs I've read in okular didn't have this problem).

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I believe that there are PDF's that have flags that set them as readonly. Use

pdf2ps foo.pdf; ps2pdf foo.ps foo.pdf

This uses Ghostscript to print the PDF into Postscript and then back into PDF, thus circumventing the readonly mechanism.

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