BetYou Didn't Know This! You cannot use your DSLR to make commercial video... seriously!

And this may be the most important reason yet to RTFM. I think this bears more scrutiny, but if it is as stated here, some people's got some 'splainin' to do.

Why Our Civilization's Video Art and Culture is Threatened by the MPEG-LA

"You see, there is something very important, that the vast majority of both consumers and video professionals don't know: ALL modern video cameras and camcorders that shoot in h.264 or mpeg2, come with a license agreement that says that you can only use that camera to shoot video for "personal use and non-commercial" purposes (go on, read your manuals). I was first made aware of such a restriction when someone mentioned that in a forum, about the Canon 7D dSLR. I thought it didn't apply to me, since I had bought the double-the-price, professional (or at least prosumer), Canon 5D Mark II. But looking at its license agreement last night (page 241), I found out that even my $3000 camera comes with such a basic license. So, I downloaded the manual for the Canon 1D Mark IV, which costs $5000, and where Canon consistently used the word "professional" and "video" on the same sentence on their press release for that camera. Nope! Same restriction: you can only use your professional video dSLR camera (professional, according to Canon's press release), for non-professional reasons. And going even further, I found that even their truly professional video camcorder, the $8000 Canon XL-H1A that uses mpeg2, also comes with a similar restriction. You can only use your professional camera for non-commercial purposes. For any other purpose, you must get a license from MPEG-LA and pay them royalties for each copy sold. I personally find this utterly unacceptable."