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No the main pdf decryption section in the pdf is encrypted with Adobe's private key and your public key.
Your RSA key is encrypted with your hardware configuration and some custom information blocks. After decrypting your private RSA key with your hardware information you can decrypt the encrypted information within your ADE pdf or epub.
Now you get your symmetric encryption/decryption key (RC4 or AES) and it is possible to decrypt your pdf with the algorithm specified in the INFO section (V = 1 ... 5)-
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