If you don't own it, or don't have permission to be on a property, it is a trespass no if's, an's, but's about it. (Exception being some parts of Canada and maybe a few states where if it's not posted you can hunt it). Course in my state, you can do it and be caught several times with the most a slap on the wrist and a $25 dollar fine. Which is cheap to these douche bags who might have to pay $500/day for a guided hunt in some states or provinces. But that's another story. I agree with halfbaked. Just shoot 'em and ask questions later. Does that indirectly answer whether it is ok the break the law?? Just my humble opinion. :>)