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The Elipsa officially states that it will not allow annotations with PDFs that have drm protection. I can certainly verify that, in fact I have been unable to annotate etc any PDFs. I have a variety of academic PDFs - freely available online - that are also not editable. I assume they are not DRMed but wouldn't know how to tell. I tried the Calibre plugin: "Apprentice Alf's DRM Removal Tool", but that didn't remove any DRM. It doesn't seem to have an option to work on an unspecified (non-Adobe) pdf.
I bought the Elipsa especially to use with PDFs and find this limitation very frustrating. Any help would be appreciated
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I recently applied annotations to a lengthy, non-DRMed PDF which, I assumed, did not contain any security restrictions.