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Software Defined Perimeter is a security system that can help to prevent attacks on cloud systems. SDP is free to use for the public and will not be subject to any usage fees or any other restrictions. The SDP Client is responsible for a large variety of functions such as verifying the device being used and the user ID that is being used. This is carried out after the user’s ID and device has been verified. The controller will link up to an issuing CA to confirm the identity of the device and the device requesting access to certain directories.