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Traffic Light Protocol (TLP) was created to facilitate greater sharing of potentially sensitive threat information within an organization or business and to enable more effective collaboration among security defenders, system administrators, security managers, and researchers.
TLP grew out of efforts by various public-sector security incident response teams of various nations that began sharing security alerts. The protocol was developed so that recipients of threat data could assess its sensitivity and determine how to share it with others, without giving any aid to the bad actors, revealing personal data, or running afoul of data privacy regulations.