Unlock secure PDF's

Searched but couldn't find any answers.

Basically trying to write a paper on Euro vs. Dollar and have a freely available paper but it is locked so I'm unable to print it off. Find it much easier to print off and make annotations and highlight then simply read off the screen so was wondering if anyone had any ideas how I can print the file?

I found an app but it was shareware and $25 and as I'm a student that isn't really an option for a single citation. Would be very grateful if anyone has any answers.