The invention relates to a DRM authentication method and system which can be taken off-line, belonging to the technical field of information security. Aiming to solve the limitation that DRM authentication must apply for copyright permission from the server, the invention provides a DRM authentication method which can be taken off-line and is characterized in that the invention comprises: contentproviders in advance use DRM encryption standard to encrypt data files and store the internal information into a piece of equipment of identification authentication which is connected with a local computer at a client side; the software of the local computer opens data files to read. The DRM authentication system which can be taken off-line is characterized in that the system comprises a piece ofidentification authentication equipment, a PC client side and a content providing side; the identification authentication equipment comprises a DRM service module and a authentication communication module. Compared with the prior art, the invention has an advantage that since users can use information under the protection of the DRM when the network is not connected, the system is more convenientand safe to use and has low cost.