Buying the source code...?

Hi , i’m thinking of buying the source code to unity.

But here is my main question…

If i edit the unity engine would i able to make unity sort of like Cryengine.? If you know what i mean… Like ( Layout , AI Path Finding , Graphics ) all that stuff.?

Thank You

You already asked this question… and got an answer:

http://forum.unity3d.com/viewtopic.php?t=18682

Oh i’m sorry i totally forgot lol