Japanese prosecutors accused a former Internet venture star Friday of calling the shots in a complex scam to inflate stock prices and doctor company books in the opening of a trial against the company and its former executives.

Disgraced Internet company Livedoor acknowledged on Friday it was guilty of violating securities regulations. Former Livedoor executive Ryoji Miyauchi, one of the defendants in the trial opening in Tokyo District Court, said on nationally televised news that he was pleading guilty.