This abstract IG includes 4 extensions on meta.security, and guidance on how to structure meaningful security labels to convey real world privacy and security policies. We will be adding addtional guidance such as search parameters for the extension. Given the lack of such guidance in FHIR and the presence of similar syntax and semantic guidance in CDA and V2 for conformance to the HL7 Healthcare Privacy and Security Classification System, this IG does supply useful implementer guidance on how to utilize the otherwise agnostic meta.security. We are developing an implementable profile for priority US regulatory security labels, which is what most implementers will be interested in. However, a implementer of data segmentation services can profile this abstract IG so that customers can create their own security labels based on the full HCS vocabulary.