FAD (Firma Autógrafa Digital) is a Mexican digital signature technology platform developed by MUUK Technologies, operating since 2005. The company provides a proprietary software solution that enables users to sign documents electronically using their smartphones or tablets by drawing their signature on a touchscreen. FAD's technology captures biometric and authentication data during the signing process, including video recording of the person signing, autograph registration, video of the signatory accepting the commitment, and an authenticity verification code, creating a unique and certified document. The platform claims to have a pending international patent and is used in over 130 countries. FAD complies with various regulatory frameworks including CUB requirements from CNBV (National Banking and Securities Commission), CUSF from CNSF (National Insurance and Sureties Commission), and UNCITRAL principles. The solution includes anti-fraud components such as facial biometry, fingerprint validation, and online INE credential validation. The platform features 13 audit trail elements for verification and compliance purposes. FAD targets multiple sectors including financial institutions, government agencies, and legal services for signing contracts, loan applications, promissory notes, and other legal documents. The technology is available through web portal and mobile applications for iOS and Android. The solution addresses the Mexican market's need for digital transformation in document execution while maintaining legal validity under Mexican commercial code principles, though digitalized autograph signatures have less legal strength than advanced electronic signatures in litigation contexts.