There's a growing debate about privacy and the overuse of personal data, in an increasingly digitalized society. Guo Bing, a professor at Zhejiang Sci-Tech University in Hangzhou, east China's Zhejiang Province, was a season ticket holder at the Hangzhou Safari Park. He used fingerprint recognition to enter the park before and had no problems with the technology, but in October last year, he received a message saying it was mandatory for visitors to use the park's facial recognition system for admission. Guo refused, and then sued the park.