Everything is locked down and filled with NDAs when it comes to console development. To access the xbox game development documentation - you need to sign an NDA (https://learn.microsoft.com/en-us/gaming/gdk/_content/gc/getstarted/gc-getstarted-toc). To access the SDK (https://www.microsoft.com/en-us/software-download/gdk) you need to be a "Registered Dev Center Partner" which requires a publisher, fee payment, and agreement (https://learn.microsoft.com/en-us/windows/apps/publish/partner-center/open-a-developer-account). BUT even more specifically section 3 of the public GDK license agreement (https://github.com/microsoft/GDK/blob/Main/LICENSE-EN-US.MD) gives an idea of what you are allowed to do with that SDK code once given access and you can only use the code for "internal" use and only make one copy for backup use. This isnt even getting into how using the GDK makes your app subject to the usage agreement (https://support.microsoft.com/en-us/windows/usage-rules-for-digital-goods-rules-83812b1f-1ecd-9a46-d3a7-ad1eadce49d1).