The SSI regulation restricts the release of SSI to people with a "need to know" (see 49 CFR §1520.11), defined generally as those who need the information to do their jobs in transportation security, for example: DHS and TSA officials, airport operators, airline personnel, railroad carriers, rail hazardous materials shippers and receivers, vessel and maritime port owners and operators, and others as noted in 49 CFR §1520.7. SSI cannot be given to the public, and is exempt from disclosure under the Freedom of Information Act.