What's the difference between Closed-Captioned and Open-Captioned?

I've heard of closed-captioned but I've not really heard of open-captioned. What's the difference between the two? Anybody know?What's the difference between Closed-Captioned and Open-Captioned?
closed captioned is the words scroll across the screen..open cap I guess are no words





http://www.washington.edu/accessit/artic鈥?/a>What's the difference between Closed-Captioned and Open-Captioned?
closed captions are between inverted commas

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