Towards Privacy Preserving Digital Rights Management Using Oblivious Transfer

Digital Rights Management (DRM) is a hot topic in digital content development. Many implementations invade users’ privacy by revealing what contents they have purchased. Preserving user’s privacy during purchasing content is necessary without doubt. Some works address the problem by providing anonymity to the user. Anonymous trade would not allow the shopkeepers to manage his customers efficiently. Also, the identities of users can still be profiled via side channels like routing paths or IP addresses. In this paper, we propose a scheme to preserve users’ privacy by hiding the users’ choices of contents from the shopkeepers using oblivious transfer (OT). We will evaluate our scheme in the aspects of security, performance, comparison, and implementation. A privacy measurement called “Privacity” is also firstly defined.