IEC 62481-4:2017(E) specifies DLNA guidelines for DRM Interoperability Solutions (DIS), which are defined as methods to enable the secure transfer and use of protected commercial content between different implementations on network media devices. This content could be protected by different content protection technologies. In this document, they are referred to as DRMs.
This second edition cancels and replaces the first edition published in 2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a)   removal of references to Mobile Digital Media Uploader (M-DMU),
b)   removal of references to Mobile Digital Media Downloader (M-DMD).