A studio found its own back catalogue inside the training data of a public model. Someone had run a handful of its older titles through a detection tool, and the tool reported, with reasonable confidence, that the model had seen them. The legal team moved quickly, because a decades-old library is the company's principal asset and defending it is the job. The engineering team was asked a simpler question and could not answer it. From the studio's own systems, could it prove when each of those wor...