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The SQL Server Processor licenses grant any number of devices or users the right to access and use the SQL Server software. These access rights are available to all devices or users, regardless of whether they are inside the organization (intranet scenarios) or outside the organization (intranet or extranet scenarios).
The Processor license contains all that you need. With a Processor license, there is no need to purchase separate Server licenses, CALs, or Internet Connector licenses.
The Processor license option in SQL Server is based on the number of processors being accessed by the operating system that your SQL Server is running on. It is not based on the number of processors that the computer that SQL Server is installed on has.
Microsoft state that "If you have made a processor inaccessible to all operating system copies on which the SQL Server software is set up to run, you do not need a software license for that processor." Source: www.microsoft.com/sql/howtobuy/faq.asp.
In other words, the computer may have four processors but the operating system (e.g. Windows Server 2003) is only accessing two of them. This means that you only need to buy 2 x SQL Server Processor Licenses. If the operating system was accessing three of the processors, then you would need to buy 3 x SQL Server Processor Licenses. And so on.
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