Which type of information is exempt from downgrade and declassification instructions?

Formerly Restricted Data is a category of information that retains its sensitivity and classification status even when it no longer falls under the standard rules for declassification that apply to other types of classified information. Specifically, it is a type of information that relates to nuclear weapons and the design or production of nuclear materials. This designation ensures that certain critical national security interests are protected, making it exempt from the usual downgrade and declassification guidelines that apply to other classifications.

In contrast, the other categories of classified information, such as Classified Data, Confidential Data, and Top Secret Data, generally follow established protocols for potential downgrade and declassification based on timeframes, the relevance of the information, and changes in national security priorities. Thus, Formerly Restricted Data stands out for its unique protections, reflecting the ongoing significance of the information to national security regarding nuclear capabilities.