Best CPA method to use with torrents?

So if I had a popular file to offer via torrents, password protected it, and required the downloaders to do something that they could provide proof of, such as download & install software, fill out a survey, watch videos, post something, etc., what is the most lucrative of these types of things and/or best way to go about this if the downloader was willing to do quite a bit for access to this file. Let me know what you guys think, please? I'm sure there is quite a lucrative method here that I am unfamiliar with as long as they are very motivated, but correct me if I am wrong. Thanks in advance for the help.