Sell and prevent sharing?

[Hemlos]

I made a tool and i would like to sell it to people who use the game it is for.
I didnt make the game, only the tool.

1. How do i pack and sell the program so people cant copy it and share it?
2. How do i go about doing this legally, without infringing on the original developers rights?

Maybe these sound like stupid questions, but ive never actually considered this till now, because ive actually created something useful, and would like to profit from it....residual income would nice

-Hem

[Sebastian]

1. Most secure would be an online database that the app connects to and checks if it's a legal version. Other than that: serial numbers?

2. Don't know, avoid copyright infringhtments like (assume game is called SUPERGAME) SUPERGAME ED...