I have concerns about copyright issues and i cannot find the right answer. I would like to buy a software and exposing it's functionality via a web site. For instance: i have bought a .rar activator from company A, installed it on my server and exposed it's functionality via my website. People will be able to upload their files and get the .rar archived file for free. The archiving process will be done on my server using the tool bought from company A. Would i broke some copyright rules?