- You can't copy the runtimes with your application. Everyone has to download the SDK
- All non SDK software (OpenKinect, OpenNI + OK, etc...) is now warrenty voiding
- Assume all software you see may be violating the SDK license
"Built to be open". Yup.
1) For virtually every MS SDK I can think of, everyone has to download it. I can't think of any where this isn't the case, although I wouldn't be surprised if there was a couple. That's standard MS practice.
2) I think those things always voided the warranty. In general, I think hacks, whether on Android, iPhone, Wii, Roombas, Dysons, or whatever will void the warranty.
I remember the iPhone SDK beta license even prohibited developers from discussing the SDK or exchanging ideas with others, thereby leaving no room for forums, newsgroups, open source projects, tutorials, magazine articles, users' groups, or books(same with iOS beta now,btw) and is restricted to people signing up for it.