Cool dog music adopts digital copyright protection technology, that is, digital rights management (DRM) technology, which is a digital copyright protection measure to ensure that music copyright is protected and prevent piracy and illegal dissemination. DRM technology will encrypt and authorize digital content, so that users can only use and disseminate digital content under specific authorization conditions. Therefore, when users use the Internet to download songs of cool dog music directly, they can't get the decryption key of the songs due to the lack of authorization, which leads to the inability to download and play these copyrighted songs.