We do not license CryENGINE to individuals. However, as long as you want to learn and use CryENGINE2 for private non-commercial purposes, you can download the free ModSDK, available at www.crymod.com, which needs to be installed on top of Crysis. This site hosts public forums with valuable information about how to use the engine, as well as public documentation. There you can find a lot of insight into the technology and contacts which may prove useful to you.