This is our digital signature software SignServer Enterprise is a server-side digital signature software, based on PKI signing used to sign any digital document. Use SignServer Enterprise to sign code, PDFs, ePassports, and more. A digital signature software with high performance and high availability. Operates on behalf of business applications. Designed to perform automated signatures (and other cryptographic operations on digital documents). SignServer Enterprise is easy to adapt to customer specific needs by using plug-ins.