It is a desirable feature in a public key infrastructure (PKI) to include the signature information in a printed do ument for authenticity and integrity cheks, in a way to bind an eletronic doument to the printed document. However, it is not easy to preserve the digital signature in the printed doument be a use the digital signature is for the text code (or the whole doument file),not for the text image (which can be sanned optically) in printed form. So, we propose a practical and secure method for preserving the authorized digital signatures for printed do uments. We will derive a printable digital signature scheme from the Korean Certificate-based Digital Signature Algorithm (KCDSA)for secure transaction and utilize the dense two-dimensional barcode, QRcode, for printing out the signature and data in a small area within a printed doument.