Any technical solution that is supposed to block teenagers from anything is not going to work very well, because you are facing an opponent that:

* is smarter than you,

* is very dedicated,

* has a lot of free time,

* has an extensive network of friends,

* faces no serious consequences if caught,

* outnumbers you,

* considers you an immoral crook.

You really, *really* want to have them on your side. That means education rather than control.