This might be useful or might be common knowledge but I wanted to share it because I spent a lot of time trying to solve it. I have a DCS-930L camera and I was not able to add it to the MyDlink Lite app or the MyDlink app because a QR Code was required. I found a QR Code from a different model in a demo video, scanned that one to understand its structure. So basically the QR Code needs to contain:
model,version,mydlinknumber,MAC,WiFi
You can find that information at the back of the camera with the exception of the WiFi name, I used the camera model and it worked fine.
You need to create a text string with that data, including the "," and use any QR Code generator on the web to create a new QR Code for that text. When you try to add the camera to the app, you just scan that code and the camera is added.