DDEX has standardised a series of Message Suite Standards that define the syntax and semantics of business metadata exchanged by members of the digital media value chain. DDEX has also standardised an automated message exchange protocol that enables the reliable communication of DDEX messages and associated documents such as resource files, using SFTP.
This standard, together with the Recording Data and Rights Notification Standard and the Recording Data and Rights Revenue Reporting Standard, is a uniform mechanism for owners of Sound Recordings and Music Licensing Companies to exchange information about rights claims and revenues for such right claims in those sound recordings or music videos.
Any organisation wishing to implement this (or any other DDEX standard) is required to apply for an Implementation Licence. The terms of the licence and an application form can be found here and here.