I created a great interactive pdf in Indesign and then added Reader extension capability in Acrobat XI. However, when I now try to add a Watermark to my Interactive pdf, using Acrobat XI, a pop-up message informs me "You do not have sufficient permissions to perform this task." I checked the file's permissions (I'm working in Mac OS X 10.8.5), and the file is listed with write permissions.
Can someone please help? Thanks!