Video and cellphone cameras have become just another part of the workday for many police officers, sometimes assisting officers in solving crimes and sometimes implicating them.

People with knowledge of the case said that prosecutors were seeking felony charges against the police officer who was videotaped knocking a man off his bicycle during an event in July.

A court battle over rules that no longer exist examines what limits, if any, the Police Department now faces from a federal court that has scrutinized the department for 37 years.

The NYPD imposed stricter rules on the videotaping of demonstrations, saying it will only be done when laws are being broken.

Cheap digital technology has ended a monopoly on the history of public gatherings that was limited to the official narratives like the sworn documents created by police officers and prosecutors.

Cheap digital technology has ended a monopoly on the history of public gatherings that was limited to the official narratives like the sworn documents created by police officers and prosecutors.

A New York City police officer was stripped of his gun and badge after an amateur video surfaced on the Internet showing him pushing a bicyclist to the ground in Times Square during a group ride.

City lawyers trying to force a group to turn over videotapes from the 2004 Republican National Convention claim that it may have copies of tapes possibly lost by the D.A.’s office.

The order raised concerns that the online video viewing habits of tens of millions of people could be exposed.

A federal judge in New York has ordered Google to turn over to Viacom a database linking users of YouTube, the Web’s largest video site by far, with every clip they have watched there.