Optical Character Recognition takes image-only PDFs and makes them searchable. A side benefit is that once a file is made searchable, you can export to an editable format like Word or RTF. Acrobat 9 can OCR in 42 different languages.
ClearScan vs Image+Text OCR
ClearScan is new "flavor" of OCR which smooths out text and accelerates printing.
OCR multiple files at once using the OCR Multiple feature
Easy, batch OCR of files using Acrobat.
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