PDF locked
I have filled up the form of 842 Application form and save file on my Macbook Air, and when I tried to open the filed it got locked and need password to open the file, however since I am not the person who lock the file I do not know the password and hence unable to open it. I have tried to open with icloud password and unlock it from get info, but the pdf file itself was locked, please help me how to open it.