It means that your lease's harvest is set by TPWD and you will receive buck and doe permits from them for you to take. You use these permits, and not your hunting license tags. Also, your season is, Oct. 3 - Feb. 28, any legal means. This means that, legally, you can hunt with a firearm during the entire season. All deer are loged into a harvest sheet with: age, sex, weight, # pts., date of kill, etc.
Your lease manager or owner should have all information that you will need.
Go to the TPWD website and you can find out more info, but this should help.