I used to like to add watermarks to pictures when blogging, mainly because I saw other bloggers doing the same. Later, I felt that the picture watermark was too ugly. At the same time, more and more pictures were inserted into articles. Adding watermarks took a lot of time, so I stopped adding watermarks to pictures. The main reason for "bringing up old things again" this time is that many friends have reported that the articles on the site have been maliciously "copied".