Password Security可以保護PDF檔案，與128位元加密或刪除密碼保護。它可以處理任何單一或一批文件，它可以設定密碼的安全檔案，自動壓縮檔案。

A-PDF Password Security is a desktop utility program that lets you change password security of existing Acrobat PDF files. That means you can protect PDF files with 128 bit encryption, or remove existing password protection. It can handle either single or batch documents. Another convenient features include password pool and hot directory.

官方網站：http://www.a-pdf.com/security/password.htm

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