![]() The most widely used and reputable one is Adobe Acrobat Pro that features a redaction tool and other tools that help remove sensitive content from PDF documents before sharing. There are many third-party tools and software designed for managing digital documents and redacting. This method definitely prevents any copy/paste or hi-tech recognition possibilities, and it also helps prevent a reader from guessing the redacted content by trying to count the number of characters that were redacted (if it is a short redaction or phrase). Replace the parts that you deleted with “ ”. When possible, use your word processor program to edit and delete the sections or words that need to be redacted. This process will digitally 'flatten' the document and prevent the ability to ‘copy and paste’ the redacted text. If you have no other options than to use the hiding strategies of inserting black boxes or changing background colors to hide text, you can then print the document, re-scan the printed document, and then save it as a new, redacted version. (This is not a full-proof method however because apparently image recognition technology is good enough now to analyze words that have been ‘blacked out’ by this manual hand method.) Print your digital document, use a black sharpie (or black paper pieces) to cross-out/cover/hide the sensitive information, re-scan the document, and then save it as a new, redacted version.
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