Outsourcing Commerical Work?

Dear unity forum users,

I have a question on the back of my mind about game development, I have used unity 3d during my school time but I am questioning buying it for my own commerical reason.
My main concern is am I able to outsource the development of my game via thrid party developers?
Would I need to buy unity 3d myself to publish the game if it is developed by a thrid party developer?
Please note I would have a prior agreement with the developer for complete rights of the game.

This is not a problem, but you can read about how to outsource application development and why companies do it