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Unlock secure, protected PDF eBooks with free and open source software. Adobe graciously allows royalty-free hacking of their patented PDF format by lowly. Programs deal with PDF files that encrypt the content using 3rd party plug-ins.

Gallery of Adobe Remedies Gallery of Adobe Remedies A large amount of useful content is now encoded as PDF (Portable Document Format) files, including files marketed for eBook document readers. Unfortunately, some of this content is not usable in all the lawful ways a purchaser desires, due to access control mechanisms created by Adobe and adopted by content publishers to the detriment of their customers. Computer professionals who have examined these mechanisms have found them easy to defeat. This web site will publish information about Adobe's access control mechanisms and the remedies people have devised to deal with them.

PDF Password Recovery Tools Here are directories of links for and tools. You can, for example, purchase Eltima's. Utility to Remedy fileOpen PDF Encryption ineptpdf (Google it) is a tool for bypassing fileOpen PDF encryption. June 2010: new fileOpen circumvention tool available from Tetrachroma: click for information.

A while back, an anonymous contributor sent the source for a program that 'reads a pdf encrypted with the fileOpen plugin, and attempts to write a plain pdf.' I have no way to contact the author, but you can send bug reports to me and I'll post them here. Xpdf and Poppler Remedies Xpdf is an open-source PDF viewer for Unix, VMS, OS/2, and Windows, available at. The documentation of the decryption feature: 'If any security features are turned on by the creator of a PDF document, the PDF file will be encrypted. These security features let an author disallow printing, copying text/graphics, editing, and/or adding annotations.' Smith at has created a patch to Xpdf that disables the security features.

The patch (revised July 24, 2001) is available. Smith writes: Patch xpdf (the diff is against 0.92 but should be easily adaptable to future version) and feed '--enable-antikick' to 'configure'. The patch is bigger than it should be; all but the bottom twenty lines or so are diffs to the 'configure' script itself. The name 'antikick' came from Harlan Ellison's 'Kick Net Piracy' campaign, btw.

It's completely untouched and genuine. No serial and no activation needed.

Ironically, I fully support him in this. Has contributed an for version 0,93, also available at. See his for more information. (Older 0,92 version and.) Mr. Nieuwenhuis writes that the difference between Mr. Smith's patch and his are that his does not disable printing protection, it only re-enables copy and paste.

FreeBSD incorporates this patch into their xpdf port. An anonymous correspondent has sent that work in versions 0.92 and 0.93 and should be easily adaptable to all future versions, and another anonymous reader sent in a.

Yet another anonymous correspondent had a comment about. Erik Hovland contributed for XPDF version 3.02p12. Is a PDF rendering library based on the Xpdf 3.0 code base. Eriv Hovland has for poppler release 0.6.4. Ghostscript is a Remedy A helpful reader wrote in to remind me that: 'GhostScript/GhostView. Handle PDF just fine and have been completely bypassing its restriction schemes for quite some time without much fanfare. There are precompiled versions for most popular OSes, donwloadable from many places.

The home page for Ghostscript is The sourceforge project page for Ghostscript is Also see the page. Geoffrey Keating's page offers appropriate patches to Ghostcript for reading encrypted PDF files. For versions 4.01 and higher, use build on Geoffrey Keating's work. Laird offers a web form you can use to convert PDF files to Postscript, and a hack for for encrypted PDF files. Thanks to reader Rashkae, who adds: 'You can then do a pdf2ps and back again with ps2pdf to generate a clean, unencrypted, printable, PDF file.' Rusty Mase, a professional cryptanalyst, Kyler Laird to crack a sample PDF file he supplied. To Mase's surprise, Laird did it.

See if you can do it too. An anonymous contributor tells how to Convert a printable Adobe eBook to an unprotected PDF file by following. Older version of MacOS X PDF Viewer is a Remedy Marc Hoffman (see March 3, 2002 entry) that the document previewer bundled with Mac OS X allows one to strip the security features from a PDF automatically simply by printing the document to a Postscript file and redistilling it.