The lockbox service provider SentriLock, owned by NAR, has sued rival Supra, alleging theft of technology. Lockboxes and the technology that supports them are a key, compelling part of the MLS and local Realtor association industry. These companies often obtain exclusive agreements with MLSs and/or the local Realtor associations that operate them, which can create downstream challenges for users. This suit may shed some light on this important industry tech.