This product is used for a signature on the document and validation. User can open any local pdf document, add Electronic seal on the pdf document.Pdf document after the signature of any modify, verification time, it can prompt: has been modified.Can be used for: Contract countersigned, send messages, and other places of leadership issuing.Users can easily configure their own seal (including: PFX certificates, seal picture and seal name), the sign, can be verified in Adobe Reader, also known as the standard digital signature.