Quote:
Originally Posted by Obscured
Sorry about the ambiguity of my post above. It was in partial answer to davidfor who asked: So, you have explicitly checked the books to make sure that they do not have any limitations?
This message appeared when I loaded a book with DRM - my PDF that showed markups didn't generate such an error message; so I thought that this indicated the probability that my earlier PDF was free from DRM.
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Yes it does. But, as I have said several times, there are other security settings in PDFs. One of those is whether the PDF can be annotated. I have been trying to get you to look at this setting to see if the book that you can read, but cannot annotate has this set.