Abstract
Digital objects have extensively existed in daily work and life. Some of them often need to be kept accessible and usable for a relatively long period of time. Therefore, digital preservation has emerged as a pressing demand for the communities of archives, libraries, and publishers, and even for ordinary computer users. However, compared to traditional papery and magnetic preservation, digital preservation poses novel challenges to these communities. In this paper, we briefly introduce how the challenges are addressed in the PROTAGE system developed by integrating the widely adopted software agent and Web service technologies.