Key Techniques of Interoperable DRM on Linux Platform

Digital rights management systems (DRMs) tend to solve two issues in rights protection of digital contents-access control and usage control. Access control concerns about how users access the contents, while usage control focuses on how users use it. In this paper, we present the key techniques to overcome the difficulties in implementation of a compatible and transparent-to-user DRM system on Linux platform. These techniques include hardware fingerprint encryption (HFE), Linux systemcall redirection and Windows inspection under XWindows system. Experiments with rendering programs such as OpenOffice-Writer (for doc file), OpenOffice-Express (for ppt file), gedit (for txt file), evince (for pdf file) and eog (for jpg file) have been carried out. The results shows that our techniques successfully solve the access control and usage control in DRM.