USB Block software (version 1.7.6) is a security tool designed to prevent unauthorized access to data on USB drives, CDs, DVDs, and other portable storage devices. The software allows users to block read and write access for specific USB devices or ports, create white and blacklists of trusted and untrusted devices, and set up password protection for added security. Additionally, the software provides real-time monitoring and logging of USB activity for effective control and management of USB usage.