Maybe you could come up with a more interesting name than 'iKnockout' though?
How about "iBrokeYourNose"?
And yeah, I don't think you can copyright a letter. Though if you could, I suspect Apple would have figured out how to by now.
Is there any possibility that they could ©-write the lower case i in front of a word as it pertains to computer software? But if we can copy-write letters I call R S T L N E.