9.4. Payment Card Industry Data Security Standard (PCI DSS)

From https://www.pcisecuritystandards.org/about/index.shtml: The PCI Security Standards Council is an open global forum, launched in 2006, that is responsible for the development, management, education, and awareness of the PCI Security Standards, including the Data Security Standard (DSS).
You can download the PCI DSS standard from https://www.pcisecuritystandards.org/security_standards/pci_dss.shtml.