When you purchase an Amazon EC2 instance with a Windows Server-based AMI, or an Amazon RDS for SQL Server license included instance, Amazon takes care of licensing costs and compliance for you. Both Amazon EC2 and Amazon RDS offer a variety of instance types and sizes, allowing you to select the optimal configuration for your target workload. Amazon EC2 AMIs with Windows Server require no Client Access Licenses (CALs). They also include two Microsoft Remote Desktop Services licenses for administrative purposes. Purchasing an Amazon EC2 for Windows Server license included instance eliminates licensing overhead and enables you to rapidly provision the compute resources you need.