i'm looking for contract langauge (usually found in the terms of
service or terms of use or acceptable use policies of web conferencing
or video conferencing or audio conferencing providers) that prohibit
users leaving their service on for long periods of time. A specific
example would be not allowing a web conferencing user to simply point
their camera  at an object or area (say a car, boat, house, parking
lot) for a long period of time to monitor the object. (ie) the idea is
not to allow a web conferencing service to be turned into a remote
security service. or an audio service to left on to monitor other
broadcasts.