Plus, is it really wrong for a content author to know a bit about how far their content has spread? In nearly all cases, an IP address doesn't tell much about you.
Try this skenario: Whistleblower at a Big Corrupt Corporation mails law enforcement officials an internal PDF document exposing illegal activities by the top management. Unfortunately the PDF was tracked and the Law Enforcer just naively opens it with Acrobat, thus alerting the corrupt management to the investigation, and giving them a head start with the paper shredders...
For a long time I thought of PDFs as just a kind of digital paper. Too bad they have now endowed it with capabilities to perform surprising activities when the document is merely read. We really need an electronic docment format that is guaranteed to be "inert". I guess plain ASCII is left, but something with richer formatting capabilities would also be nice.
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