NH has an open land policy, allowing people to go on property that is not posted. In the woods, this makes sense. When people start getting close to homes, it can get creepy, but is still legal, as long as they are not entering buildings. Liability may be a concern of property owners, but NH laws address this. Because the state economy depends on recreational use of land and cooperative land owners, liability laws shield the land owner from most recreation use liability issues. Details can be read at
http://www.gencourt.state.nh.us/rsa/...212/212-34.htm
When your security camera records someone "recreating", you have evidence that you are sharing your land and helping to keep NH the special place that it is. Thank you! If you don't want to participate in the open land policy, put up signs. If the camera records someone entering buildings or damaging your property, you have evidence if you decide to report it.
You probably won't get in trouble recording video on your private property, but may want to make it clear by putting up a "security cameras in use" sign, especially if you want to post pictures of people walking by. If you record people on neighboring property or erotic sights or sounds, it is best to keep the recordings to your self, so you don't run afoul of the NH privacy laws
http://www.gencourt.state.nh.us/rsa/.../644/644-9.htm