This document relates to areas of classified information

Classified information

Classified information is sensitive information to which access is restricted by law or regulation to particular groups of persons. A formal security clearance is required to handle classified documents or access classified data. The clearance process requires a satisfactory background investigation...

 and document classification

Document classification

Document classification or document categorization is a problem in both library science, information science and computer science. The task is to assign a document to one or more classes or categories. This may be done "manually" or algorithmically...

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The Traffic Light Protocol (TLP) was created to encourage greater sharing of sensitive

Information sensitivity

Information sensitivity is the control of access to information or knowledge that might result in loss of an advantage or level of security if disclosed to others who might have low or unknown trustability or undesirable intentions....

information. The originator signals how widely they want their information to be circulated beyond the immediate recipient.

The TLP provides a simple method to achieve this. It is designed to improve the flow of information between individuals, organizations or communities in a controlled and trusted way. It is important that everyone understands and obeys the rules of the protocol. Only then can trust be established and the benefits of information sharing realized.
The TLP is based on the concept of the originator labeling information with one of four colors to indicate what further dissemination, if any, can be undertaken by the recipient. The recipient must consult the originator if wider dissemination is required.

The four colors and their meanings

There are four colors (or traffic lights):

• RED - personal for named recipients only

In the context of a meeting, for example, RED information is limited to those present at the meeting. In most circumstances, RED information will be passed verbally or in person.

• AMBER - limited distribution

The recipient may share AMBER information with others within their organization, but only on a ‘need-to-know’ basis. The originator may be expected to specify the intended limits of that sharing.

• GREEN - community wide

Information in this category can be circulated widely within a particular community. However, the information may not be published or posted publicly on the Internet, nor released outside of the community.

•  WHITE  - unlimited

Subject to standard copyright rules, WHITE information may be distributed freely, without restriction.