Unity3d and open source license

Hi,

I'va noticed that Unity application uses at good list of MIT and BSD licensed libraries. However, I didnt' find a any trace of MIT licences included to application itself.

At least, use of libxml2 library requires that MIT license shall included to product itself

"The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software."

Where I can find this copyright notice from latest Unity3D application ?