| http://www.w3.org/ns/prov#value | - The screen display shows a watermark of the recipient's e-mail address, so if they take a screen shot, it can later be identified. (There is also a Spotlight feature that obscures all of the page except for the part right around the cursor, to make it even harder to take a screen shot.) The permissions travel with the document, so if the recipient forwards it (if they are allowed to), the same restr
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