The concept of "contained in" means that classified information comes from what type of source into a new document?

The concept of "contained in" refers to the idea that classified information is sourced from an authorized source when it is included in a new document. An authorized source is one that has been deemed appropriate for conveying classified information, typically governed by established protocols and regulations. This ensures that the information being used in the derivative classification process is legitimate and in accordance with security standards.

By relying on authorized sources, individuals can ensure that they are using information that has been properly evaluated and can be appropriately shared or classified in a new context. This is critical for maintaining the integrity and protection of sensitive information, as unauthorized or unverified sources could compromise security protocols and lead to the dissemination of incorrect or harmful information.

In distinguishing this option from the others, restricted sources may imply limitations on information usage, while unverified sources lack established credibility, and public sources do not qualify as classified information at all. Therefore, only authorized sources ensure that the classified content included in a new document maintains its required level of protection and relevance.