MobileSigner is based on the SealSign Engine solution, from 11 Paths, a Telefonica Company. SealSign Engine is an enterprise server that integrates electronic digital signature of documents in business applications and mobility devices. It is a complete, flexible and versatile signature engine: • Web service-based architecture. • Electronic document format: PDF, XML, Office, Open Office, CMS... • Simple and advanced signature formats: PKCS#7/CMS and CAdES, XMLDSig and XAdES, PDF Signature