Announcement of the new Trust Legal Provisions (TLP 4.0)

December 28, 2009

Season's Greetings!

This message is to announce that the IETF Trustees have adopted on a new version of the Trust Legal Provisions (TLP), to be effective 28 December, 2009. The Grace period for old-boilerplate will begin on that date, and last through 1 February, 2010.

The new document updating the Trust Legal Provisions is available in PDF and HTML formats from and the PDF version is available directly at

Please note that this URL always points to the current TLP. A stable URI for the TLP effective 28 December, 2009 is

The new document updating the Trust Legal Provisions was approved by the Trustees after a consideration of "last call" comments in a telechat on December 17, 2009, subject to there being no further substantive public comments.

Informally, this version has been referred to as "TLP Version 4.0."

The requests for comments for this change were issued on November 25, 2009 4:34:48 PM EST in a message entitled "Request for comments on proposed changes to the IETF Trust Legal Provisions (TLP)." An editorial change to this document was proposed on December 7, 2009, 4:23:24 PM EST in a message entitled "Proposed Editorial Change to the Legal Provisions Relating to IETF Documents (TLP)."

The Trustees would like to thank everyone who participated in the vigorous discussion about these changes.


Marshall Eubanks
Chair / IETF Trust