A promotional video for camera company Leica has triggered a setback in China for a famous image on Tiananmen Square.
The video features photographers working on conflicts around the world, including a photographer documenting the 1
A boycott of the camera brand was demanded on the Chinese social media site Weibo.
Leica has distanced herself from the video.
"Tank Man" was a single protester who stalled a tank column in 1989 in a clash against protests in Beijing.
He refused to go out of his way and climbed onto the leading tank talking to the driver. He was later pulled away from the scene by two men. What happened to him remains unknown.
The Leica video begins with the title "Beijing 1989" and shows a photographer who makes the famous picture. The "Panzermann" can be seen in the lens of the camera.
Users of the Chinese social media site Weibo are currently not allowed to comment on any official posts by Leica. BBC Monitoring has found that some people succeed in publishing carefully worded comments on previous official Leica contributions.
A search for the hashtag Leica shows that 42,000 users have posts on Weibo, but only 10 are available.
Some comments encourage users to "boycott the camera" and joke that the company is associated with "patriotic Huawei".
The Chinese technology giant Huawei has been restricted by telecommunications networks in the US and other countries for security reasons. Consumers in China have changed to the company that uses Leica technology in its latest handsets.
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A spokeswoman for Leica told the South China Morning Post that the film was not an officially approved marketing film commissioned by the company. At the end of the footage, however, are Leica cameras and the company logo.
They added that the company "has to distance itself from the content shown in the video and regrets misunderstandings about wrong conclusions that may have been drawn."
The BBC has asked Leica for additional comments China keeps Tiananmen off the Internet
By Kerry Allen, BBC monitoring China analyst
China has been commemorating the 1989 activists of the Tiananmen incident for years banned and the online discussion about it strictly regulated.
When users search for "Tiananmen" on domestic search engines like Baidu or social media platforms like Sina Weibo, they only see sunny pictures of the Forbidden City in Beijing. When images of tanks running along Chang'an Avenue are visible in the search for images, they come only from victory parades.
Hundreds of references to June 4, 1989 are banned by thousands of cyber police year-round, and Weibo reinforces the censorship of seemingly innocent clues to the incident on his jubilee.
Simple candlemojis and number sequences referring to the date, such as "46" and "64" (June 4) and "1989" (the year of the protests), are immediately deleted. Small businesses also have difficulty marketing items on June 4 of each year if their selling price is 46 or 64 yuan. Such advertisements are quickly removed by nervous censors.
However, creative users always find ways to circumvent the censors. For example, in 2014, when Taylor Swift released her 1989 album, the album cover came with the words "T.S." and "1989" was considered by users to be an effective metaphor to talk about the incident – as T.S. You could say, "Tiananmen Square".
In 1989, more than a million Chinese students and workers occupied Tiananmen Square and started the biggest political protest in the history of Communist China. Six weeks of protest ended with the bloody crackdown on demonstrators from 3 to 3 June.
Estimates of the death toll range from a few hundred to over 1,000.
China's statement at the end of June 1989 stated that 200 civilians and several dozen security personnel had died in Beijing following the suppression of "counterrevolutionary riots" on 4 June 1989.