Whiplash February 20 news, according to the Blue Dot Network reported that many social users reported that the Douban app embedded an imperceptible watermark in the page, if the user has logged in to the account, the screenshot may include the user account.
It is reported that the watermark information added by Douban includes the user UID, TID and the complete time with time zone, and the color used by the watermark information is the same as the background color of the web page, which is difficult to see, but it will be seen when the night mode is turned on.
If you use the mouse to select all areas, you can find the watermark through the highlighted background, or you can find the watermark by adjusting the color of the screenshot through the color grading software.
If the user is logged in, the watermark contains the user UID, and if there is no login, the watermark contains information such as tid and time.
At present, it is not clear why Douban added this blind watermark, but embedding an invisible watermark means that if the user takes a screenshot on the page, then Douban can find out the identity of the screenshot owner. It is worth mentioning that at present, Douban has modified this blind watermark to hide the user ID.
According to the whip, in December last year, Douban was ordered by the Ministry of Industry and Information Technology to take down the shelves due to privacy issues, and the App has not yet been restored to the shelves.