I have purchased a few PDF eBooks (RPG rulebooks) and they come with a set of bookmarks, but with such "technical" books, I would really like to be able to add new bookmarks for easy reference. (Normal PDF bookmarks would be best, because I'd like to use them on my tablet as well.)
However, these PDF files are secured ("watermarked" it said) and I cannot edit anything about them. The PDF security info that Adobe reader gives looks like this:
Security: Password Security All contents of the document are encrypted ... Document Restrictions Summary: Printing: Allowed ... Content Copying: Allowed ... Commenting: Not allowed ...
Anything I can do?
Note that while it says "Password Security" I myself don't have any password for this file, I just open it with a PDF reader and can then read it just fine.
Note: Personally, I don't care whether the document is still secured afterwards or whether doing anything is "legal" in anyone's opinion or some random jurisdiction. I payed good money for that document, I don't plan on sharing it, I just want some post-it notes in my tablet ready rulebooks ;-) .