Nothing will stop someone from stealing your trail cams if they want it bad enough. Also if you did come up with some way to keep them from getting it off the tree more than likely they would just destory the camera anyways. I have 4 trail cams that I use on public land and so far so good. I have had way more trail cams destroyed by bears than humans. Now if I could just keep them from trying to find out what is inside of my trail cams!!!!!!