Crack PDF with Certificate Encryption

A friend gave me a PDF document with Certificate encryption, he bought from a vendor. The PDF even does not allow copy text, so he wanted me to crack it. After effort, I removed the encryption. And I also developed a software to do this kind job without need Adobe Acrobat, but I am not sure if it is legal or not, so I can not release it until I know it is legal.

BTW, Digital Signature vs (Certificate) Encryption
A digital signature can guarantee the integrity of the message and the identity of its sender. Encryption can prevent someone from being able to read an intercepted message.

Update: just noticed that LiveCycle Workbench ES has the feature, Remove PDF Certificate Encryption

Returns an unsecured PDF document when given a PDF document encrypted with a certificate. After certificate encryption security is removed from a PDF document, it is no longer secure.

Reference,
Remove PDF Certificate Encryption

5 thoughts on “Crack PDF with Certificate Encryption”

  1. 膜拜大哥
    pdf带有证书的解密也也测试了几种方法,都可以正确解出文档页面
    不过一直不能实现把加密文件的目录和pdf附带的附件解出来
    希望指点下

    LiveCycle ES这软件太大,3GB,看起来好像可以解密,不过不会用
    感谢大哥指点

  2. 我使用的是iText/iTextSharp,没有下载过LiveCycle ES,对这个软件不熟悉,只知道(从Adobe官网介绍)可以解密证书加密PDF,当然前提都必须有证书,而且知道证书密码。

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