Ask Slashdot: Encrypted digital camera/recording devices?

Ransak writes: "As dashboard cameras catch more unplanned events, I've thought of equipping my vehicles with them just in case that 'one in a billion' moment happens. But given how much over reach law enforcement has shown, I'd only consider one if I could be ensured that the data was secure from prying eyes (ie, a camera that writes to encrypted SD memory, etc). Are there any solutions for the niche market of the paranoid photographer/videographer?"