For organisations operating in high-security environments, maintaining a closed network is non-negotiable. The is a critical tool for these "air-gapped" systems, allowing for robust remote access without ever exposing internal machines to the public internet.
While RealVNC 6.x used a 25-character key, RealVNC 7.x (and later) uses a longer offline license file or token . realvnc offline license key new
In certain per-user subscription models, even the RealVNC Viewer must be licensed offline if it is being used in an air-gapped environment. How to Obtain and Apply Your New Key For organisations operating in high-security environments