Signed PDF could also be used for "PDF tracking", pointed out by @DidierStevens http://blog.didierstevens.com/2013/05/13/adobe-reader-and-crls/ …
@HaifeiLi @DidierStevens PDF tracking has been a native feature of Adobe Reader as far as I remember. Just try out Adobe LiveCycle RM.
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@newsoft@DidierStevens Yeah, I would agree, I saw something recently. PDF has never been just a document..Thanks. Twitter will use this to make your timeline better. UndoUndo
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