Microsoft Office is the de facto office software used all over the world. ID-Sign for MS Office is a suite of plugin technologies that add multi-parties digital signature support to nomal MS Office files, supporting Office2000, OfficeXP, Office2003 and Office2007. ID-Sign supports unlimited number of signatures in the same document, and can highlight the contents signed by a specific user. ID-Sign is designed to be easy to use, secure, functionally complete, and can complement nicely the functionalities found in MS Office. ID-Sign supports USB crypto tokens, including fingerprint-based tokens, and any X.509v3-compliant digital certificate. User just needs to carry a USB tokens containing his/her keys and certificates, can plug in any computer with a USB port and sign any Office document. ID-Sign supports offline signature verification as well as online certificate validation using CRL and OCSP. ID-Sign is designed to be secure for business use, making it impossible to hide fraudulent contents in a digitally signed document. ID-Sign is designed to be used in any enterprise applications that require legal-binding, non-repudiatable digital signature, including billing, procurement, online contract, collaboration, workflow, ERP systems, financial and accounting systems, online tax filling, etc. It is especially well suited for systems that require multiple signatures from multiple parties, and systems that need to process huge amount of repetitive paperworks. ID-Sign is designed to be easily integratable to existing enterprise applications, to help our customers streamline their business process into an automated system.