According to several sources, Intel has leaked a 2.8GB (5.86GB unzipped) archive of Alder Lake source code and internal documentation, including likely BIOS source code and confidential data for chipset partners for 12th generation Core processors.

The leaked archive contains hundreds of engineering and technical files, as well as documentation and tools designed to create BIOS/UEFI firmware for Intel's Alder Lake platform and chipsets for 12th generation processors.
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Industry representatives explained that the duck didn't come directly from Intel, but probably from the company's partner network. Judging by the logs, it could be Lenovo.

Experts have already found fragments of data on MSR (Model Specific Register, microcode interface registers) registers of last year's generation of Intel processors in the leak. This is classified information that is not in the publicly available documentation for this development.

Experts also found the Intel Boot Guard private key, which Intel provided to vendors, in the leak. This is classified confidential information.
Experts and independent developers continue to investigate the new Intel processor leak.
In August 2020, Swedish developer and IT consultant Tillie Kottmann published online links to an archive with 20GB of Intel processor firmware source code and internal documentation, including debugging tools, schematics, drivers, tutorial videos. Kottmann explained that most of the data she posted had never been published before and was marked confidential in accordance with NDA or Intel's corporate Restricted Secret standard.
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Industry experts have analysed the leak and confirmed that it does contain Intel intellectual property information, including documentation and source code. And some of the files in the leaked archive date back to May of this year.