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Analyze and help extract older "hidden" versions of a pdf from the current pdf.
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pdfresurrect ------------ PDFResurrect is a tool aimed at analyzing PDF documents. The PDF format allows for previous document changes to be retained in a more recent version of the document, thereby creating a running history of changes for the document. This tool attempts to extract all previous versions while also producing a summary of changes between versions. This tool can also "scrub" or write data over the original instances of PDF objects that have been modified or deleted, in an effort to disguise information from previous versions that might not be intended for anyone else to read. Notes ----- The scrubbing feature (-s) should not be trusted for any serious security uses. After using this feature, please verify that it in fact zero'd all of the objects that were of concern (those objects that were to be zero'd). This tool relies on the application reading the pdfresurrect extracted versions to treat the last xref table as the most recent in the document. This should typically be the case. The verbose output, which tries to deduce the PDF object type (e.g. stream, page), is not always accurate, and the object counts might not be 100% accurate. However, this should not prevent the extraction of the versions. This output is merely to provide a hint for the user as to what might be different between the documents. Object counts might appear off in linearized PDF documents. That is not truly the case, the reason for this is that each version of the PDF consists of the objects that compose the linear portion of the PDF plus all of the objects that compose the version in question. Suppose there is a linearized PDF with 59 objects in its linear portion, and suppose the PDF has a second version that consists of 21 objects. The total number of objects in "version 2" would be 59 + 21 or 80 objects. Building -------- From the top-level directory of pdfresurrect run: ./configure make To install/uninstall the resulting binary to a specific path the '--prefix=' flag can be used: ./configure --prefix=/my/desired/path/ Debugging mode can be enabled when configuring by using the following option: ./configure --enable-debug The resulting binary can be placed anywhere, however it can also be installed/uninstalled to the configured path automatically. If no path was specified at configure time, the default is /usr/local/bin To install/uninstall: make install or make uninstall Thanks ------ The rest 757/757Labs crew. GNU (www.gnu.org). All of the contributors: See AUTHORS file. Contact / Project URL --------------------- email@example.com https://github.com/enferex/pdfresurrect