[jforman]

That's far more simplistic than what the law actually says (where "law" is the collection of statutes and judicial interpretations).

As an example:

http://resources.uscannenbergmedia.com/2016/08/videotaping-a...

"Remember, even if you’re in public, you cannot record conversations between two people unless you have their permission. This includes conversations that you’re one of the parties to. If one person in the conversation can reasonably expect his or her conversation to be confidential, this standard applies."

If you're having a private conversation in a public park, then it is probably illegal for somebody else to record you.

Driving is a different question. Personally I think since a license plate is literally meant to publicly identify your car, a reasonable person should expect it to be recorded. But my guess is this will go to SCOTUS at some point, since privacy is increasingly being invaded in unanticipated ways by private companies.