To the best of my knowledge, the Starbucks Venti is twenty fluid ounces everywhere. Here in the UK, that makes it the same as a pint, but I understand that a US pint is only sixteen ounces - a Starbucks Grande. As for the trademark issue, it's highly likely that they only hold the copyright for the purposes of selling their excellent, if costly, coffee. I could produce a software package called Venti, or a car (if Fiat haven't got it for that purpose) - but not a coffee.