This standard establishes the design and usage requirements of the padlock icon for visually communicating the presence of security features on a check. The standard specifies characteristics of security features that meet the requirements for use of the padlock icon. Information about specific security features can be found in ASC X9/TG-8. Although overt security features are required to meet the requirements to use the Check Payment Systems Association's (CPSA) registered padlock icon@ the additional use of covert security features is allowed on checks and encouraged as further enhancements to deter or identify check fraud.