German computer software company Bitmanagement Software is suing for the U.S. government for $596 million, accusing the U.S. Navy of installing hundreds of thousands of unlicensed copies of Bitmanagement’s virtual reality software.

Bitmanagement says the Navy had licenses to install the software, which allows users to view “virtual” military bases, on 38 computers. While negotiations were underway to expand that contract, Bitmanagement claims that the Navy installed unlicensed copies on more than 500,000 computers.