From simple standard serially produced contracts to highly complex ink and hand-traded pieces of paper negotiated and regulated, filling pieces of paper is so « old school ». Signatures are modern handshakes. They signify mutual agreement and make contracts legally valid by verifying the authenticity of documents and making all parties identifiable. In a modern legal system, they are also used to prevent fraud and protect personal safety. However, collecting signatures and concluding a contract by all parties can be a tedious and difficult task if done manually and without a proper contract management system. This is one of the main reasons why most modern businesses use digital signatures to close their business.