Is there a software program that can scan movies (mpg, divx, xvid, x264,

dvd, etc) and remove foul language? I have copied a lot of my movies to a media hard drive and have decided I want to remove the foul language so I do not need to listen to it. I can re-rip the DVDs if necessary, but do not want to have to go through an entire movie manually to remove the foul language. Logically this could be done by using the subtitles to sense the foul language, similar to TVGuardian. Any ideas or suggestions on an easier way to do this other than manually or have to rent Cleanflix?
Some have suggested getting airline movies, but where is that possible, and I doubt they have the same selection I do...

Yeah, no software is availble or that, and would be really expensive anyways.