The article points out that, as AI-generated content becomes rampant in our lives, it poses numerous risks to platforms and users. To enhance the transparency and credibility of content, major platforms have introduced a feature requiring creators to declare their AI-generated content. Digital watermarking is emerging as an effective method widely accepted by all parties, capable of automatically adding anti-counterfeiting marks to AI content and protecting the copyright of creators' works. Although watermarking technology is still immature, it can at least reduce the risk of spreading false information, enabling content tracing and copyright verification.