I think you read the article wrong. The “editing for use in the classroom” means that instead of buying the DVD and copying for use in the classroom (think videotaping a program like National Geographic for the classroom the next day), they are suggesting the teacher buy a video camera, videotape the TV and then show the class.
Which doesn’t make sense because either they have a DVD camcorder (do they even sell the old VHS ones anymore?) or using a digital camcorder and putting it on DVD.
So maybe I’m the one that’s confused.
It's about the circumvention of the copy protection on the DVD. They don't want a teacher to rip a DVD and put the class-relevant parts into a video. They want the teacher to spend money, buy a camcorder, make a severely inferior copy by shooting a TV screen, import that into a computer, then edit that.
If the teacher puts it on a DVD the teacher will likely not use the copy protection so that's not an issue.
I think you are right. It’s as if they confused videotaping a broadcast under the fair use act, with videotaping a TV display of a copyrighted DVD.
I’m not sure exactly what the rules under the fair use act are. I would think if you only have an excerpt of a broadcast you are using for educational means, that could probably use it in a class, but I’m not certain. But I don’t think you could ever use even an excerpt from a copyrighted DVD without permission.