Based on Wikipedia Ubuntu is covered mainly under GNU GPL. In my company anything related to GPL means - can't be used, they are very afraid of legal traps related to GPL.
That's why I have this question: can Ubuntu Server on Amazon EC2 be used as a host OS for commercial web application?
If yes, is there any legal documents proving this? I found About Ubuntu Licensing. Is it enough to be sure my company is safe from any legal issues?