ICT development has currently reached the level in which the components have become smaller with high speed performance and cheap cost. On line library or digital library can be referred to as a new information institution or as expansion of library service. However, behind the simplicity of digital library lies a danger that threats the integrity of digital library data and collection. Data stealing, vandalism, mutilation, and other threats are ready to attack anytime. Concerning this issue, librarians in the digital era need to be aware of cybercrime modes in digital library and their weak points in order to minimize them.