verified, evaluated, and auditable by users. The user must ask questions such as, "What are your procedures?", "What are your methods?", "How is this system evaluated?", and "What is your disaster preparedness program?". These questions will enable the user to evaluate the system, create a successful maintenance plan for their materials, and enable the system to be reinforced by a carefully evaluated support structure. The source code for the entire LOCKSS system carries BSD-style open-source licenses and is available from GitHub. LOCKSS is a trademark of Stanford University. See also Clock of the Long Now Digital library Digital preservation National Digital Information Infrastructure and Preservation Program Portico (service) References Further reading External links LOCKSS (YouTube video, June 2007) LOCKSS Part I: Why Libraries Should Care About LOCKSS (YouTube video, December 2007) CLOCKSS, "Controlled LOCKSS", a federated global (vice local) LOCKSS archive Digital library software Free institutional repository software Peer-to-peer computing Software using the BSD license