Definitive Media Library (DML)
A Definitive Media Library, or DML, is a set of secure storage areas in which an organization's definitive, authorized versions of application configuration items (CIs) (software and software packages) are stored and protected, together with their path. The aims are as follows:
- To monitor and control software installed in the organization.
- To ensure that the same version of software will be installed on every workstation.[1]
ITIL defines a Definitive Media Library (DML) as the place to store "official" versions of all media, including software, documentation and licenses. In order to begin a Definitive Media Library (DML) you will need to first set a definition for what you want in the DML. Once you have your definition, you need to identify all specific instances of “definitive media” that fits your organization’s definition. Once identified, place them under your control by adding information and attributes about the media into your DML tool. For physical copies of boxed or purchased software, gather those together for storage in a locked physical location (cabinet, etc.) Once you identify and control then apply your regular Change, Configuration and Release processes to the media.