PDF 관련

A. PDF edit

1. adobe, http://www.adobe.com

1. Foxit Advanced PDF Editor ,commercial, http://www.foxitsoftware.com/

2. PDF-Xchange Pro, commercial, http://www.tracker-software.com/

B. PDF unlock

1. http://www.crackmypdf.com ,web

2. http://www.pdfunlock.com    or     https://www.pdfunlock.com , web

3. Sybrex SpeedPDF Protection Manager ,commercial

4. PDF Password Remover ,   http://www.passwordunlocker.com , commercial

Etc

1. http://foxyutils.com/blog/archive/  , web

2. http://smallpdf.com/kr/unlock-pdf , web