1Fourth Amendment protects against state action; reasonable expectation of privacy (Katz 1967).
2Carpenter v. US (2018) declined to extend third-party doctrine to comprehensive location histories — the doctrine is in motion.
3US sectoral patchwork: HIPAA, GLBA (revised Safeguards Rule effective June 2023), FERPA, COPPA, ECPA — plus growing state patchwork.
4GDPR operationally: data subject rights, 72-hour breach notification, cross-border transfer mechanisms, DPIA, DPO.
5Contextual integrity (Nissenbaum 2010): privacy is appropriate flow, not secrecy. Compliance can still violate context.
6Schrems II (2020): invalidated Privacy Shield; the EU-US Data Privacy Framework (2023) is in force but contested.