You are generating a derivatively classified piece of information and are looking for information in a classified database. While you are searching, you find a piece of information that is extremely helpful. It appears to include all of the classification markings including portion, banner, and classification authority block. Is this information authorized for use as a source of derivative classification?

Yes

Explanation:

A classified information is piece of information that is hidden from public eyes as it could threaten national security if exposed

A derivatively classified piece of information is a piece of information document that extracts information from a classified information source and incorporates this information into the document. These classified documents bear classification markings which are used to show that the information is classified and give instructions on handling and dissemination. A derivative classifier is one who develops classified information using authorized classified information sources

Section 1.4 of Executive Order 13526 lists categories of information eligible for classification