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I'm trying to use iText Java. When you run the example " how to sign " the following error occurs: Caused by: java.lang.ClassNotFoundException: org.bouncycastle.tsp.TimeStampTokenInfo According "Getting Started with iText - How to sign a PDF using iText" , I have to use the BouncyCastle . I downloaded the file: bcprov-jdk15on-147.jar from BouncyCastle download page. And added to the project: Java Build Path/Libraries/Add External JARs... I added the following line: Security.addProvider(new BouncyCastleProvider()); When you run the example the same error occurs. So I downloaded another file: bcpkix-jdk15on-147.jar entitled "PKIX/CMS/EAC/PKCS/OCSP/TSP/OPENSSL" And added to the project: Java Build Path/Libraries/Add External JARs... Now I have two Jars. When you run the example the following error occurs: Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.DEREncodable I tried downloading the file "bcprov-ext-jdk15on-147.jar" but did not solve the problem. I am using iText 5.2.1 and eclipse on Windows 7 64 bits.

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