Dr.PDF is a powerful and reliable PDF app designed for Mac users. There are two main features within it:

• Recovering PDF open password and the other is for removing PDF permission password. This PDF password recovery utility is able to crack both simple and strong password from encrypted PDF files, which comes with three effective password recovery engines, including Brute-force, Brute-force with Mask and Dictionary. The user can get the password cracked in a short time after a few settings. In addition, it supports hardware acceleration (both CPU and GPU)
• Dr.PDF is also capable of unlocking PDF files instantly with restrictions, such as copy, edit or print. After unlocking, you are free to make any kind of changes to target PDF file