Oak and Sparrow Systems Enterprise LLC offers Gatekeeper, an AI governance layer that intercepts employee interactions with commercial AI systems before data leaves the organization. The company says Gatekeeper evaluates content against legal and compliance rules, blocks prohibited output, and records decisions as cryptographic artifacts. It has presented the product as aimed at organizations using commercial AI systems, but no verified customer list, funding history, founder names, executive roster, or office locations were available from the sources provided.