Method for protecting the copyright of Java application files, device and mobile terminal

The invention discloses a method for protecting the copyright of Java application files, comprising the following steps: browsing and selecting to download the Java application files; calling a DRM interface when a mobile terminal determines that the downloaded Java application files are DRM protected files, acquiring and judging the installing copyright state of the Java application files, if the installing copyright is valid, installing the Java application files; if the installing copyright is invalid or does not have copyright, ending the installing process. Correspondingly, the invention also provides a device for protecting the copyright of Java application files, comprising an application server and the mobile terminal. The invention also provides a mobile terminal for protecting the copyright of Java application files, comprising a browser, an AMS module and a DRM module. The invention can control the installation and use of the Java application files in the mobile terminal.