28 CFR §17.25

1. (a)Classified information must be marked pursuant to the standards set forth in section 1.7 of Executive Order 12958; ISOO implementing directives in 32 CFR 2001, subpart B; and internal Department of Justice direction provided by the Department Security Officer.
2. (b)Foreign government information shall be marked or classified at a level equivalent to that level of classification assigned by the originating foreign government.
3. (c)Information assigned a level of classification under predecessor Executive Orders shall be considered as classified at that level of classification.