![]() A SLP 2.1 involves checking the presence of a matching OEM-supplied key, an OEM-specific certificate and the most challenging part of the puzzle an OEM-specific ACPI_SLIC table (SLIC 2.1 table) before it can activate. Both methods works similarly with only a change in marker in Windows 7 based PCs. There are files on hard disk when windows is installed which were being matched with the value from BIOS for verification, if matched your copy gets activated. SLP 1.0 was cracked quite easily which demanded for a more complex system to be developed resulting in SLP 2.0 included with Windows Vista and SLP 2.1 shipped with Windows 7. This method uses an area of BIOS to store some identification data, in SLP 1.0 the version included with XP, this was simply the name of the OEM. With Windows XP a method called System-Locked Pre-installation (SLP) was devised. ![]() ![]() a need was felt to get windows activated right upon installation without going through all the annoyance. But with OEMs like Dell, Sony, Lenovo etc. ![]() I will start with basics of how a copy of windows gets automatically activated when installed on OEM (original equipment manufacturer) based PCs, traditionally when a copy of windows is installed you have insert your license key and activate by verifying it with Microsoft via internet or by getting a confirmation id over telephone. ![]()
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