A long-standing dispute between the three co-founders of Australian video technology giant Blackmagic Design has escalated into public litigation, with one founder alleging he has been excluded from dividend payments and blocked from selling his stake.

The legal action centers on a disagreement over a proposed $1.5 billion venture capital deal, highlighting significant friction within the ownership group of the privately held firm that has become a dominant force in Hollywood film production software.

The lawsuit reveals that the co-founders are at odds over the company's financial distribution and exit strategy.

While the business has achieved substantial commercial success and industry recognition, the internal governance structure appears to be fracturing under the weight of differing priorities among the wealthy owners.

The filing suggests that one founder feels marginalized in decision-making processes regarding capital allocation and potential liquidity events for shareholders.

This development introduces material uncertainty for a company that has operated largely behind closed doors.