The alleged ringleaders of a Chinese counterfeiting gang that sold at least $2 billion worth of bogus Microsoft Corp. software were sentenced Wednesday to prison terms of up to 6 1/2 years, in what is believed to be the harshest penalties yet under China’s tightened piracy laws.

The punishments meted out against the 11 defendants, and announced by Microsoft Corp., could help China improve its image as a country that doesn’t crack down hard enough on copyright violators, though the technology and entertainment industries still say China has a long way to go. The sentences ranged from 1 1/2 to 6 1/2 years, according to Redmond, Wash.-based Microsoft.

The fact that Microsoft, and not the Chinese courts, disclosed the sentences is not unusual. Lawyers are the only source of information in many cases in China because rulings often are not publicly announced. Court officials usually refuse to disclose details to reporters.