Blackout is a document security platform that originated as redaction software and has expanded to support additional document handling tasks. It is used to redact content, including data within Excel files, and to organize and tag documents for review and production. The platform also supports the secure sharing and transmission of sensitive materials. Blackout is designed to address discrete, document-focused tasks commonly associated with legal and compliance workflows. With seamless integration into Relativity, Blackout allows users to apply pattern-matching rules to their legal documents and run automated redactions and markup jobs with the push of a button.

In October of 2024, Milyli, developer and proprietor redaction software, Blackout, announced the non-exclusive licensing of Blackout's source code for native Excel redaction to Reveal, a global provider of eDiscovery and investigation technology. Reveal will make its upgraded redaction solution for native Excel available on its enterprise Reveal platform in early 2025 and plans to do the same with its Logikcull platform in 2026.