Supreme Court lets mystery company file appeal under seal

The case has remained a high-profile mystery, with the Supreme Court and lower courts declining to identify the company, the country that owns it or the purpose of the subpoena. More details about the company's legal arguments were revealed in redacted court papers made public after the nine justices permitted it to move forward with its appeal to the high court under seal, a process that keeps many facts about the matter secret. The company is facing a daily fine of $50,000 imposed by a U.S. federal judge in Washington for refusing to comply with a subpoena issued in the unidentified investigation.