Encrypt/Decrypt pdf files in adobe air applications

Hi Friends
I want to encrypt and decrypt pdf files in adobe air application. I tried it many ways but am not getting it right method.
Please help me this situation.

AFAIK, Adobe Acrobat has features to add security to pdf file, but as for decrypt pdf files, you need to give the password. For example, Adobe Acrobat 9 standard.  Decrypting pdf seems not the issue of acrobat. You can find proper version of Acrobat to encrypt your file, whereas decrypt pdf document, you need to turn to a pdf password removing program to achieve that.

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