yes, MrBond. DHII is probably right.
I cannot imagine of some company betting the copyright for a LETTER.
I remember some years ago, Philipp Morris wanted to get the copyright for
the colour red in advertisements for making Marlboro and the colour red a undevideable
combination that was not allowed to be copied, even in parts, by contenders.
This was rediculouse and they failed at the court with it, of course.
But if you want to see, what creative impact this 'brandmarking' of prefixes got,
check this small flick about a software called ' I###### 2.0 ' :
http://www.arkhamfilms.com/i######.html BANQUE