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I am trying to clear up what appear to be hugely misleading assumptions about how PDFs work. Edit: and based on the information provided in these news reports,

• ajross 9y ago
  > I am trying to clear up what appear to be hugely misleading assumptions about how PDFs work. I'm sure you are. But in the process you are spamming an only tangentially related subthread with the clear implication that PDFs store editting history in the way Word documents do (they don't). This is doing the opposite of what you want. No one here is talking about "editing PDFs" or making PDFs "secure from editting", so your points are only confusing the matter.