Automated Copyright Notice System (ACNS) 2.0

Did you get a notice?

If you want more information on the standard computer-readable encoding of copyright notices, please read the specifications below. If you need more information about your specific notice, please use the ISP and rights holder contact information in the notice you received.


Copyright 2009-2010 Motion Picture Laboratories, Inc.  This work is licensed under the Creative Commons Attribution-No Derivative Works 3.0 United States License.

This location holds the specifcation, XML schema and documentation for the Advanced Copyright Notice System 2.0. Original ACNS may be found here:

For questions or comments, please contact acns (at...)


The Automated Copyright Notice System was developed in 2003 by NBC Universal and Universal Music Group (UMG) with support from Disney to help facilitate the efficient handling of copyright infringement notices at ISPs.

From that site:

ACNS stands for Automated Copyright Notice System. It’s an open source, royalty free system that universities, ISP’s, or anyone that handles large volumes of copyright notices can implement on their network to increase the efficiency and reduce the costs of responding to the notices. The system is a flexible design so that it can be implemented on just about any network, using already available network equipment such as routers and packet shapers. It is not intrusive and does not invade the privacy of the networks users, and it let’s the university or ISP enforce its own policies with regard to network abuse and copyright infringement. The system could also be utilized to handle abuse complaints, viruses, worms, trojans, and other malicious network activity. Below you can find links to more information about ACNS and the XML that enables it.

Please refer to that site for background and previous versions.

ACNS has been successfully deployed worldwide. 

The document expands the original ACNS (0.7) to ACNS 2.0.  The extensions were motivated by feedback from Higher Education, ISPs and notice generation agents who wanted additional information to be carried within the basic framework.

ACNS 2.0 is designed to be fully backwards compatible with ACNS 0.7


ACNS 2.0 Specification

  • Advanced Copyright Notice System (ACNS) 2.0 , MPL-ACNS2, Version 1.1a, June 23, 2010
    • Released version (PDF)
    • With redlined differences from v1.0 (PDF) v1.1 to v1.1a (PDF)

ACNS Delivery

  • ACNS 2.0 Email Delivery, MPL-ACNS2-E, Version 1.0, February 11, 2009 (PDF)
  • ACNS Message Containers, MPL-ACNS2-M, Version 0.9, August 16, 2010 (PDF)

ACNS Profiles

  • DRAFT ACNS P2P Profile (PDF)
  • DRAFT ACNS Server Profile (PDF). Covers UGC, Cyberlocker, link sites, etc.


Previous Versions

Version 1.1

  • Advanced Copyright Notice System (ACNS) 2.0 , MPL-ACNS2, Version 1.0, April 24, 2009 (PDF)
  • 1.1a is a text a minor text-only change from 1.1 that added best practice for AlsoSeen. The schema is unchanged.

Version 1.0

  • Advanced Copyright Notice System (ACNS) 2.0 , MPL-ACNS2, Version 1.0, February 11, 2009 (PDF)
  • ACNS 2.0 Version 1.0 (XSD) (Schema Documentation)