What is it called when you include already classified information in a new product?

Including already classified information in a new product is referred to as derivative classification. This process involves taking existing classified information, whether from documents or other sources, and incorporating it into a new document or product while maintaining the same level of classification. This ensures that the sensitivity of the original classified information is preserved and properly reflected in the newly created material.

In practice, derivative classification is crucial because it helps in managing and protecting sensitive information while allowing for its dissemination in a manner that follows established guidelines and protocols. It also involves the responsibility of the classifier to ensure that they are not inadvertently disclosing or downgrading classified information.

The other terms listed, such as aggregate classification, layered classification, and secondary classification, do not accurately describe this specific process. Each of these could imply different methodologies or principles within classification systems but doesn't capture the essence of incorporating existing classified material into a new context.