You can hunt wo/a hunting license ONLY on private land,
and...ONLY when a hunting season in not currently going on
On public land, a hunting license is ALWAYS required

From Oklahoma Department of Wildlife Website
<Quote>ON PRIVATE LAND - No hunting license required, except during youth deer gun, deer muzzleloader, deer gun, special antlerless deer gun (in open zones), elk gun (in open counties) and antelope (in open areas) seasons, hunters must possess a filled or unfilled license appropriate for the current season,(like deer) is going on, then you will need an Oklahoma hunting license<UNQUOTE>

With archery deer season running from the 1st week of October thru the middle of January
You will need to have a hunting license(w/deer tag) to hunt hogs during that time period, even on private land!

Check out the Oklahoma Dept of Wildlife's webpage
on hog hunting regs
http://www.wildlifedepartment.com/regs/huntregs10.htm

Bill
Oklahoma Crossbow Shooters Assn