Schemes to prevent movie piracy are released almost as often as new movies. The latest idea is to manipulate cinema projectors so that a movie cannot be filmed from the stalls using high-definition camcorders.
Electronic projectors use red, green and blue lasers to beam a colour image onto the big screen. The Corporation for Laser Optics Research in Portsmouth, New Hampshire, proposes to cut these laser signals for a few milliseconds, up to 50 times each second. This strobing effect is too fast for the human eye to see, but it clashes with the speed at…
