iText1.4.7 and iTextSharp3.1.7 supports AES encryption

AES means Advanced Encryption Standard.
PDF encrypted with AES method, will open supports Adobe Reader 6.0(or Acrobat 6.0) and upper, but also more safer.
and there are also a bad news, pdfcrack supports crack PDF with AES encryption. and there exists win32 version.

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