Initially, Nintendo was the only developer for the Famicom. Under pressure from Namco and Hudson Soft, it opened the Famicom to third-party development, but instituted a license fee of 30% per game cartridge for these third-parties to develop games, a system used by console manufactures to this day. Nintendo maintained strict manufacturing control and requiring payment in full before manufacturing. Cartridges could not be returned to Nintendo, so publishers assumed all the financial risk of selling all units ordered. Nintendo limited most third-party publishers to only five games per year on its systems (some companies tried to get around this by creating additional company labels like Konami's Ultra Games label); Nintendo ultimately dropped this rule by 1993 with the release of the Super Nintendo Entertainment System. Nintendo's strongarmed oversight of Famicom cartridge manufacturing led to both legitimate and bootleg unlicensed cartridges to be made in the Asian regions. Nintendo developed its golden seal of approval on all licensed games released for the system to try to promote authenticity and detract from bootleg sales, but failed to make significant traction to stalling these sales.