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copied!<p>I found these resources:</p> <ol> <li><a href="http://www.stillhq.com/pdfdb/db.html" rel="nofollow noreferrer">Stillhq.com PDF Database/Mikail's PDF database</a> A large number of real world PDFs, some of which are broken. Free.</li> <li><a href="http://www.qualitylogic.com/Contents/Printer-MFP/Technology/PDF.aspx" rel="nofollow noreferrer">QualityLogic’s PDF 1.7 Application Test Suite (ATS)</a>. Commercial.</li> <li><a href="https://web.archive.org/web/20150228065245/http://acroeng.adobe.com/wp/?page_id=10" rel="nofollow noreferrer">Adobe PDF test suites</a> (Web Archive link, no PDFs available).</li> <li><a href="http://www.gwg.org/download/test-suites/ghent-output-suite/" rel="nofollow noreferrer">Ghent Working Group Test Suites</a> A number of easy to judge patches that show support (or lack thereof) of essential PDF features. Oriented towards graphic arts and support for PDF features that are part of PDF/X-1a and PDF/X-4. Free to use for workflow / RIP / hardware validation.</li> <li><a href="http://www.opf-labs.org/format-corpus/pdfCabinetOfHorrors/" rel="nofollow noreferrer">PDF cabinet of horrors</a>. Free archive of bad pdf files</li> </ol> <p>Also of interest:</p> <ol> <li><a href="http://www.altonatestsuite.com/en/index.php" rel="nofollow noreferrer">Altona Test Suite</a> Commercial test suite aimed at printing houses</li> <li><a href="//www.pdfa.org/isartor-test-suite/" rel="nofollow noreferrer">Isartor Test Suite</a> Free test suite for PDF/A-1 compliance</li> <li><a href="http://www.pdflib.com/knowledge-base/pdfa/validation-report/" rel="nofollow noreferrer">Bavaria Test suitde</a> Free test suite for PDF/A-1 compliance</li> </ol>

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