Question download protected pdf from website

[iam4ever]

hello everyone,
i am challenged to download protected pdf from one site. I try using programs, codes, inspect elements and other stuff but so far no success. So please do not see this as piracy. I will no take profit from this, but i really wanna know how it works. Here is link to document.

 

[bignastyid]

We will provide no assistance in bypassing security measures. Thread closed