You're looking for information on Windows 8.1 Pro Build 9600 and its product key.
2. Disable Unnecessary Services
If you previously had a genuine copy, you can often retrieve the key using these methods: Windows 8.1 PRO Build 9600 Product Key. - Microsoft Q&A
Windows 8.1 Pro Build 9600 is a version of the Windows 8.1 operating system, which was released in 2013. The "Pro" edition is designed for business use, offering additional features such as Remote Desktop, BitLocker, and support for domain joining.
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The search term reveals a genuine user need: a reliable, fast, and permanent Windows 8.1 Pro activation. But chasing free, “extra quality” keys online leads only to malware, counterfeit licenses, and frustration.