https://www.theregister.co.uk/2019/08/26/black_hat_sued/

Crown Sterling, a Newport Beach, California-based biz that calls itself "a leading digital cryptographic firm," is suing UBM, the UK-based owner of the Black Hat USA conference, in America for allegedly violating its sponsorship agreement.

The complaint [PDF], filed late last week in a New York district court, blames the conference organizers for allowing Black Hat attendees to disrupt Crown Sterling's talk about supposedly disruptive cryptographic technology – a presentation Crown Sterling paid $115,000 to present to hackers. The heckling then spilled online.