That was a good source for flexibility but the problems in getting desired results are picking which exercises, in which order, "for you." There are so many types of exercises and stretches, many of which may seem the same but have different benefits.
http://www.stadion.com/stretching_scientifically.html
This is good source because it is broken down accordinging to the sport including MA and high kicking. It's more than strecthing alone. You have to strenthen the muscles to make them able to be stretched and decrease the possibilty of injury.
Some of the exercises do involve weights but it is not set in stone as you can choose alternatives for "your" purpose. The exercises are definately not bodybuilding exercises. It's not really a lot of weights, weights in some instances get faster results. Just don't over due it (to heavy). Most exercises are non weights. The video gets more into the weights than the book. But again, not heavy weight.
The biggest benefit is your guess work is pretty much eliminated. If you can afford it get the book and video. I was really flexible when I was young and over the years I stopped kicking high. So when doing BJJ I found I wanted to get my flexibilty in my legs back.
I still don't focus on kicking high but for the benefits of your arts in general it is great. For BJJ alone, the amount of flexibilty for your legs is amazing. If your goal is the full splits, to the front and the side, it is already "tailored" for you.