author or the copyright statement of the original website when reprinting content from copyrighted websites or official publications, or completely ignore its license terms, causing infringement of the copyright of others. For example, Wikipedia entries use Copyleft's free content licensing terms, while Baidu Baike’s copyright license is not free. Baidu Baike’s use of Wikipedia’s entry content is copyright infringement. Some even copy all Wikipedia entries, which violates the copyright law of mainland China. Due to copyright issues, the content of Baidu Baike does not meet various accepted definitions of openness or freedom. Unsourced and inaccurate information In addition to copyright disputes, the criticism of Baidu Baike mainly focuses on its academic merits and lack of neutrality. The former is manifested in the lack of detailed and clear source references for the entries it contains, which is contrary to the academic criterion of listing sources, and also makes the accuracy and credibility of the entry to be questioned. Baidu Baike does not limit entries based on notability. The content of some entries is directly copied from other websites without any research, and also contains a certain amount of personal original research. In addition, Baidu Baike has been criticized for the proliferation of advertisements, which has sullied its reputation as a trustworthy, independent encyclopedia. In 2011, an online poll involving 561 Baidu Baike users showed that the main criticisms of users on Baidu Baike included "insufficient review and proliferation of wrong content", "too much plagiarism and copy-pasting and too little original work", "information contained on the entries" and "lack of authority and credibility". A 2022 study compared articles about liver diseases in English Wikipedia and Baidu Baike. According to the authors, both encyclopedias lack quality and are not satisfactory. But Wikipedia is updated more often than Baidu. Vandalism and spoof entries See also Chinese encyclopedias List of online encyclopedias References External links 2006 establishments in China Baike Chinese online encyclopedias Internet properties established in 2006 Wiki communities 21st-century encyclopedias Chinese-language websites