Despite the legal and ethical gray areas surrounding the leak, the nt5src.7z file has been used for several technical preservation and development projects: mrcxlinux/srv03rtm-anika: Windows Server 2003 Source Code
If you’re a researcher, the safest route is to that can handle the material responsibly. Many organizations have “trusted‑research” channels for dealing with leaked source. Nt5src.7z Notrepacked