Custos Media Technologies is a South African company that uses blockchain technology to protect digital content from piracy. Spun out of the MIH Media Lab at Stellenbosch University, Custos developed a novel approach to digital rights management (DRM) that embeds Bitcoin-based bounties within digital media files using imperceptible watermarks.

The company's core innovation works by placing small cryptocurrency bounties inside distributed copies of protected content such as films, ebooks, and screeners. If a recipient leaks or pirates the content, anyone who discovers the watermarked file can claim the embedded bounty, which simultaneously alerts the content owner to the source of the leak. This approach uses economic incentives rather than traditional DRM restrictions, effectively crowdsourcing piracy detection on a global scale.

Custos has worked with film distributors, publishers, and media companies to protect pre-release screeners and digital review copies, which are common sources of pirated content. The technology was recognized with awards from organizations including the Innovation Prize for Africa and the South African National Science and Technology Forum. The company represents one of the earliest practical applications of cryptocurrency incentive design applied to an industry problem outside of finance.

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