This wonderful website has some code (footer) that is encrypted. Therefore it is impossible to make sure that the theme is safe and does not hide malicious code (you don't konw, it could be code sending your passwords to someone...).
Moreover it is said in footer file : "This file is protected by copyright law. To reverse engineer or decode this file is strictly prohibited."
in the licence file it is said : "You are free:
* to Share -- to copy, distribute, display, and perform the work
* to Remix -- to make derivative works"
this is opposite to the previous statement making the use of this theme legally hazardous.