This article explains using measure units to locate signature and its size on document page with GroupDocs.Signature API....Classification Product Solution Purchase...
This article shows how to add metadata signatures to the image exif metadata layer with various data types...Classification Product Solution Purchase...
This article explains how to provide advanced search for metadata electronic signatures with GroupDocs.Signature API....Classification Product Solution Purchase...
This article explains how to sign document with Text signature by GroupDocs.Signature API. Let's try to add digital signature to a PDF programmatically....Classification Product Solution Purchase...