Windows 10 — Tweaking Privacy Settings for Fun & Profit

Updates Delivery

Windows 10 can obtain updates from other systems on the local network and systems on the internet — not just the official Windows Update servers. Additionally, your system will supply updates to other systems.

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\DODownloadMode — 0 (off), 1 (on, LAN only); 2 (LAN and other Internet hosts)