If there is some software that adds a watermark to video, then there must be some other program that removes the watermark from video. Watermarking a video is very simple and fast, because its actual operation is just to add watermark to each frame in batch. However, removing the watermark in a video is just like removing the watermark from an image - there are two problems: 1) more complex image processing techniques are required (mainly to calculate and refer to the color distribution around the selected area); 2) it's unable to remove the watermark perfectly, there will always be some flaws.