>For years I wondered what the brown oval blob that occasionally
>showed up on cinema screens during the movie was (usually top
>right corner).  A couple of years ago I discovered it was an
>anti-piracy thing.  Not sure how it was supposed to work, apparently
>it upset cameras somehow.  It was also supposed to be invisible to
>people.  Right.  Annoys me more now that I know what it is.

Are you sure that is not the "end of reel" marker where the projectionist
starts the next projector? I assume it is done automatically these days, but
such a marker used to be used to tell the projectionist to start the
projector with the next reel, so you didn't have down time between reels.

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