 The Definitive Media Library provides the storage area for software objects ready for deployment and should only contain master copies of controlled software media configuration items (CIs) that have passed appropriate quality assurance checks, typically including both procured and bespoke application and gold build source code and executables.In the context of the ITIL best practice framework, the term Definitive Media Library supersedes the term definitive software library referred to prior to version ITIL v3.In conjunction with the configuration management database (CMDB), it effectively provides the DNA of the data center i.e.