The designs and system features of five leading DRM products, including EBX, Adobe, Apabi of Founder Electronics, Microsoft Windows Media DRM, and Real Helix DRM are briefly listed.

• 本文对这两类典型应用中的主要DRM系统和产品，包括EBX、Adobe、方正Apabi、Windows Media DRM、Real Helix DRM系统设计和特性作了扼要陈述。