The company's response to these hacks was to assert that users did not own the devices and had no right to modify or reverse engineer them. Threats of legal action against the hackers swiftly brought on more controversy and criticism. The company changed the licensing agreement several times, adding explicit restrictions, apparently in response to hacker activity. Hackers argued that the changes did not apply retroactively to devices that had been purchased under older versions of the license, and that the thousands of users who received unsolicited CueCats in the mail had neither agreed to nor were legally bound by the license.