Which type of information may NOT be considered classified?

Data shared within the public domain is not considered classified because it is openly accessible to the public and does not require special clearance or handling due to its sensitivity. Classified information, by definition, is that which requires protection from unauthorized disclosure for national security reasons. This typically includes specific documents or materials that are restricted based on their level of classification—such as Top Secret or Confidential.

In contrast, Top Secret military strategies, Confidential government communications, and sensitive research and development information all have specific guidelines dictating their classification and handling to protect national interests and ensure security. Such information is restricted to individuals with the appropriate security clearance and is not available to the general public. This distinction makes data shared within the public domain clearly separate from classified information.