WeChat is the international edition of Tencent's messaging and payments platform, whose privacy policy describes collecting registration and log-in data, log data including device attributes and communication metadata, location data from GPS, WiFi, IP address or geo-tagged posts, chat data, and payment card information, with data controllers split between a Singaporean entity for most international users and a Dutch entity for Europe, and intra-group flows to Shenzhen Tencent Computer Systems in the Chinese Mainland. In May 2020 the University of Toronto's Citizen Lab published research finding that documents and images sent entirely between non-China-registered accounts undergo content surveillance for material politically sensitive in China, that this surveillance is functionally undetectable to users and disclosed in no policy document, and that it is used to build up the censorship system applied to China-registered users; Tencent's responses to data access requests failed to clarify the practice.