Imitext is a bitmap subtitle transmission technique proprietary to Screen Subtitling Systems. The technology has been licensed to Scientific Atlanta for incorporation into their PowerVu encoders and decoders. ... Found on http://en.wikipedia.org/wiki/Imitext
1) Assistive technology 
Imitext is a bitmap subtitle transmission technique proprietary to Screen Subtitling Systems. The technology has been licensed to Scientific Atlanta for incorporation into their PowerVu encoders and decoders. ...