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In 2009 Adobe Digital Editions was broken by i♥cabbages allowing users to remove the DRM protection from Adobe ebooks. #GOOGLE PLAY BOOKS DRM REMOVAL CALIBRE DEDRM PDF#Removing PDF Passwords covers this subject in more detail. Either the user password or owner password can recover the encryption key and decrypt the file content. The encryption key is encrypted and stored in the file’s encryption dictionary. See PDF Security issues and weak DRM implementations for further information.Īdobe’s standard security handler uses RC4 stream cipher, encrypting file content with a unique encryption key. 20 years on and removing the DRM from ebooks is still trivial. This is nothing new – Elcomsoft pointed out the issues with Adobe PDF DRM and other ebook protection methods back in 2000. It’s simple: the above DRM security has been implemented as an afterthought (and usually rather badly), enabling applications to either plugin to (to access the content as it is decrypted or intercept the decryption keys) or pickup unprotected content that the system has directly cached to disk. You might ask why these ebook DRM removal applications are so successful.
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