Playing backed-up games

[Porkchops]

First of all, I'd just like to say sorry for all the n00b questions I've been posting - I'm brand spankin' new to the whole mod-chip scene.

I know that a mod-chip is required to back up Xbox games (to get EvoX on the Xbox). Are mod-chips also required for playing backed up games? i.e. if I were to bring my disc down to my friend's house, who's Xbox is not modded, would it run?

Thanks for all the help guys! You have been very helpful and informative.