Identification and markings
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) Classified information, in all forms, must be marked in a manner that is immediately apparent pursuant to the standards set forth in section 1.6 of Executive Order 13526; 32 CFR part 2001, subpart B; and internal DHS guidance approved and distributed by the Office of the Chief Security Officer.
(b) Foreign government information shall retain its original classification markings or be assigned a U.S. classification that provides a degree of protection at least equivalent to that required by the entity that furnished the information.
(c) Information assigned a level of classification under predecessor Executive Orders shall remain classified at that level of classification, except as otherwise provided herein, i.e., the information is reclassified or declassified.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.