New Delhi, March 9 -- Anthropic on Monday filed a lawsuit seeking to stop the US Department of Defense from placing it on a national security blacklist, intensifying the artificial intelligence company's dispute with the US military over restrictions on the use of its technology.

Last Thursday, the Pentagon imposed a formal "supply-chain risk" designation on Anthropic, restricting the use of its technology. A source said the technology had been used in military operations in Iran.

In the lawsuit, Anthropic argued that the designation was" unlawful" and violated its rights to free speech and due process. The case, filed in a federal court in California, asks a judge to revoke the designation and prevent federal agencies from enforcing it...