Abstract: The technology of digital rights management is a new kind of information secure technology developed in recent years, which realizes protection of digital content and rights of copyright owners by digital rights management and technology of copy prevention. The core ideas of digital rights management are based on right protection and usage control of digital resources. This paper discusses the key technology of protection system of copyright used to protect PDF document and adaptability of it, studies the framework of PDF document and the security mechanism, analyzes PDF document usage control mechanism, usage control method and implementation tool.

Key words: PDF document, security mechanism, usage control