Is it safe too give someone your iPhone UDID?

Someone i know wants me to beta test some of they are company's app's, But for me to do that i need iSO 7 beta, He said i can pay the 100$ Apple fee to have my own personal account, or he'll register my UDiD for free with his, is it safe letting other people do it? What is the UDiD for? I Like to be a secure person and i don't know much about the UDiD or what it is.

Check this video: http://www.ibtimes.co.uk/articles/487976/20130709/ios7-beta3-install-iphone5-iphone4-iphone4s-ipad.htm

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