MinosTheNinth - 10:05 am on Sep 24, 2012 (gmt 0)
So you have an application and want to give 2 hour trial to anyone?
I would do it via registration. But unless you use Facebook, or similar profile to sign in, you can never be sure that one person will register multiple times. (Even with facebook, this isn't sure, there are lot of fake profiles).
Or, you can force users to fill bigger amount of personal data. But still, they can use fake data. And you have to protect and work with their personal data according to laws in your country.