Yes, there are two types of watermarks, explicit watermarks and hidden watermarks. The explicit watermark is the one you can see directly in the video, usually appearing in the top left and bottom right corners. When you share a video with a watermark directly, it is in principle OK. But the best solution is for you to go and get the authorization of the original owner.

The hidden watermark is invisible to you . There are various methods . The most common method is called video fingerprint, which is buried in the basic information of the video. If you want to remove this video fingerprint, you need some separate software.

Please be careful not to upload other people's videos without watermark directly to other platforms, you may put yourself at risk. You need to do the secondary creation or de-duplication of the video.