Abstract: Protection to electronic documents is one of the most important contents to information leakage prevent. Based on the analysis to the existing technologies to protect electronic documents, this paper presents a multilevel protection technology to electronic documents based on the clipboard monitoring. It puts forward a clipboard monitor strategy by which document path can be obtained. And then it puts forward a dynamic adjustable classification protection strategy for document, which can protect documents dynamically according to the information which is obtained by clipboard monitoring. The corresponding prototype system was implemented. The experimental results show that the electronic document protection technology based on the clipboard monitor can avoid the document content leak through the clipboard according to the requirement of protection to electronic document.

Key words: clipboard monitoring, documents protection, information leakage prevent