Which of the following is NOT an authorized source for derivative classification?

The concept of derivative classification involves taking existing classified information and using it to create new classified documents or materials. An authorized source for this process is one that is reliable and officially recognized for providing classified information, which ensures that the derivative classification is based on verified and validated data.

In this context, an "unconfirmed source" lacks the authoritative validation that is required for properly deriving classification from it. Using information from an unconfirmed source could lead to the disseminating of potentially inaccurate or unverified data, which is counterproductive to the goals of maintaining national security and the integrity of classified information. Therefore, it is critical to rely on confirmed, authorized, and official sources when conducting derivative classification to ensure the information is trustworthy and aligns with the established security protocols.

In contrast, confirmed sources, official government reports, and classified materials that have been provided from credible sources are all authorized for use in the derivative classification process, as they support the integrity of the classification standards.