This article originally appeared in TidBITS on 2011-05-19 at 8:01 a.m.
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PDFpen and PDFpenPro 5.3

by Marco Tabini

Smile has released new versions of PDFpen [1] and PDFpenPro [2], their PDF manipulation software. Version 5.3 adds several security enhancements, including the capability to encrypt data using 128- and 256-bit Advanced Encryption Standard (AES) algorithms, which are preferred by the U.S. government and required for the storage of medical records. Also, AES-256 encryption in PDFpen now supports Unicode in passwords, and the encryption method can now be set via AppleScript. ($59.95/$99.95 new, free update, 41.4 MB)