There clause won't hold up under the Open Source GPL, on which they are basing their licensing. Their license is invalid and therefore anyone can use their software any way they see fit, now, HAHAHA!!
If the license is held invalid it defaults back to NO permission
Lets ad some more clauses:
no discrimination based on the sexual orientation of the computer
no discrimination based on the ethnicity of the programer
computer users must subscribe to a manditory diversity quota.
You will not pull on superman's cape.