(For example, look at the piece from last Sunday’s 60 Minutes broadcast, discussing the recent discovery that many of the printed copies of Columbus’s letters to King Ferdinand in famous museums, including the Vatican’s, describing his first voyage to the New World are actually very recent forgeries, and that one of the stolen documents was discovered in the US Library of Congress. PDFs as created may be locked for editing and password protected for access-at least when transmitted electronically-I have no idea how one can block editing access to a piece of paper once one has it in one’s possession, at least if one has the right software tools). If one creates (or copies) a PDF by scanning a paper document, the creator of the document may be very unhappy to learn that it’s been altered. I’m pretty certain it was conceived as a way of distributing printable documents that would look the same on screen or in print, and that capability was one of the things that made the PostScript Laser Printer such a success in the 1980s. However, there is of course a huge difference between searchable and editable, and that brings up the very intention of the nature of the PDF document format.
As Adam mentioned, there are many ways to create searchable text by OCR in scanned documents e.g., the scanning/OCR software available with Evernote for Mac.
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