Virtru Inc., a startup that helps enterprises prevent unauthorized access to their data, commercializes an open-source file format known as TDF designed to let organizations to securely share sensitive data with one another. TDF works by connecting files to a server controlled by the company that created them. This server encrypts the files and only decrypts them for users who have permission to view them. Virtru sells a cloud platform that uses TDF to help companies encrypt files before they move outside the corporate network. Users can specify who may view the records and revoke access through a centralized interface. The platform also provides other cybersecurity controls. Workers may set an expiration date for shared files, watermark them and monitor how they’re accessed. The recipients of such files can only open them using a Virtru-operated cloud application that is activated with one-time codes. There’s a standalone file sharing service called Virtru Secure Share, as well as versions that integrate with Google Workspace and Microsoft 365. The latter tools can encrypt not only business files but also emails. Another Virtru product called Virtru Private Keystore helps enterprises manage the encryption keys and generates an audit trail that tracks how encryption keys are used. Another tool called Data Protection Gateway scans inbound emails, detects sensitive data such as credit card numbers and encrypts them.