Legal status is the current enforceability of a patent. A patent may be in force, expired, lapsed, revoked, or otherwise unavailable for enforcement. In practice, this tells you whether the right holder can still use the patent to block making, using, or selling a technology in a given jurisdiction.
In cyber security, legal status is a key part of patent clearance and freedom-to-operate reviews for software, hardware, and security tools. A patent that exists on paper may not pose a risk if it is no longer in force, while an active patent can create exposure for a product feature, encryption method, or device design. Teams check legal status alongside claims and territory to avoid shipping a tool that later needs redesign, licensing, or a legal challenge.