Convertible Drm System Based on Identity-based Encryption

With the rapid growth of the Internet, acquiring digital contents over the Internet has become commonplace. Most traditional items can be translated into digital form. That is to say the digital contents can be distributed easily and rapidly to users over the Internet. Unfortunately, situations of piracy are common and become more serious, since the digital contents can be copied and distributed easily through Internet. Thus, Digital Rights Management (DRM) is a popular tool used to protect digital contents with cryptographic technology. But there are many different DRM encryption formats that are adopted by different content providers, causing consumers can’t play their contents on devices with different DRM format even though they bought it legally. In this paper, we employ identity-based encryption to allow a conversion between different DRM systems. Through the conversion process, the digital content can be used at different DRM systems and hold the legitimate use of the right.