I have a PDF which I don't now the version or the software created it. when I open it with Adobe Acrobat 8.1 professional and check the properties, there is no password or restriction; but when I open it with Adobe Reader 8.1, there are some restrictions and it does not allow me to comment on the PDF. What's wrong with that plz?
My Product Information:
Reader Pro 8.1 / Windows
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This happens when the author of the PDF file did not enable Adobe Reader extensions.
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