The official policy is that personal wine brought to a dining venue or bar invokes a corkage fee ($25 I think). Personally I have never been charged the corkage fee when I brought bottles of wine that were gifts from my agent or whoever and delivered to my cabin into the main dining room for an assigned seating dinner. Of course in those situations our waiter didn't really want to jeopardize his tips for the sake of a corkage fee. I have heard reports of it happening at My Time dining, and in some other circumstances. I don't bother bringing my own wine aboard.