Mark Zuckerberg’s Meta has won the backing of a judge in a copyright lawsuit brought by a group of authors, in the second legal victory for the US artificial intelligence industry this week.

The writers, who included Sarah Silverman and Ta-Nehisi Coates, had argued that the Facebook owner had breached copyright law by using their books without permission to train its AI system.

The ruling follows a decision on Monday that Anthropic, another major player in the AI field, had not infringed authors’ copyright.

The US district judge Vince Chhabria, in San Francisco, said in his decision on the Meta case that the authors had not presented enough evidence that the technology company’s AI would dilute the market for their work to show that its conduct was illegal under US copyright law.