What are the listed companies of digital watermarking?

"The concept stocks in the digital watermarking industry are: Hanbang Hi-Tech and Digital Video. The report of the first quarter of 2022 shows that the digital video company achieved a net profit of 32,695,438+0,000 yuan, a year-on-year growth rate of -73.04%. Digital Vision is the first DRM(Digital RightsManagement) product solution provider in the industry to pass the security assessment of DRM laboratory in China, the first digital watermarking product solution provider to pass the security assessment of DRM laboratory in China, and the only enterprise in China that owns both DRM and digital watermarking products.