Widely used PDF files capture text and images nearly exactly as they display in the application that created them. The format is designed to store text and both bitmapped and vector images, with the text available for searching, copying, and even editing in the proper app. That “copying” part can lead to oceans of trouble when people try to remove details from a PDF before distribution—redacting details from a court case, government documents, or even inter-company communications—by drawing black
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