Just a few quick questions.

So I just recently purchased a copy of Torque 2D because it seemed like the perfect engine to use for a game me and a friend have been planning for a very long time now. Over the past few days I have been playing around with the engine and doing many of the tutorials to learn exactly how it works and I have become very intrigued by the use of behaviors, which has made me curious about the following.

I've noticed a lot of behaviors with copyright's at the top, which made me think if i write my own behaviors does copyrighting actually work with that stuff? I mean its a coding language is it really even possible to copyright that? couldn't someone just re-write my code and claim it as there own?

Second Question Is how advanced do behaviors get? Can I put together an entire game only using behaviors, but not just a simple asteroids game or something, what I mean is can a really advanced like game be made with behaviors. For example a game that utilizes many things sch as crafting, smelting, mining, attacking, dual wield weapons, skill trees as well as abilities that effect the player in different ways.

Now my third question is more along the lines of licensing. Essentially I'm picking up a new computer and need my Torque engine moved from my old computer to the new computer. Does this effect my Licensing in anyway?

Thanks in advance for any help.