Well, this is not good. Chunks of source code related to internal Windows builds that have not yet been released to the general public were leaked online. According to The Register, a “massive treasure trove” totaling 32TB of official and non-public installation images and software blueprints was compressed down to 8TB and uploaded to BetaArchive.com,

Source: Hot Hardware – Massive Windows 10 Core Source Code Leak Puts Redstone And ARM OneCore Builds At Risk