a system with its methods of detecting whether users are willing to access the biometric systems has been developed that includes acquiring the signal of an anatomical feature having a biometric feature , acquiring a dynamic feature for willingness test with / without biometric feature , isolating a region of the signal having the biometric feature , extracting feature descriptors from the region to identify a user , extracting a unique user consent signature from the dynamic feature for willingness test , storing the of feature descriptors and willingness signature into an electronic database and matching the feature descriptors and consent signatures with the ones stored in the electronic database during registration . two types of consent biometrics schemes with two authentication example designs are developed .