Security policy filter

Definition
A security policy filter is

"[a] hardware and/or software component that performs one or more of the following functions: content verification to ensure the data type of the submitted content; content inspection, analyzing the submitted content to verify it complies with a defined policy; malicious content checker that evaluates the content for malicious code; suspicious activity checker that evaluates or executes the content in a safe manner, such as in a sandbox or detonation chamber and monitors for suspicious activity; or content sanitization, cleansing, and transformation, which modifies the submitted content to comply with a defined policy."