Those Reddish-Brown Dots Shaped Like a “T” in Movies

So there was this thing I kept noticing on films projected in the theater. A series of reddish-brown dots which was shaped like a “T” in the middle of the frame. I finally looked it up and lo and behold, the internet in its infinite wisdom answered the mystery.

According to answers.yahoo.com and wikipedia, those are “cap codes” which are placed in the movie to help track down where a particular pirated copy might’ve come from.

REFERENCES:
http://answers.yahoo.com/question/index?qid=20070929230731AAMtv1T
http://en.wikipedia.org/wiki/Coded_Anti-Piracy