From https://xmpp.org/extensions/xep-0001.html#appendix-legal

gistfile1.txt

CopyrightThis XMPP Extension Protocol is copyright © 1999 – 2024 by the XMPP Standards Foundation (XSF).

Permissions
Permission is hereby granted, free of charge, to any person obtaining a copy of 
this specification (the "Specification"), to make use of the 
Specification without restriction, including without limitation the 
rights to implement the Specification in a software program, deploy the 
Specification in a network service, and copy, modify, merge, publish, 
translate, distribute, sublicense, or sell copies of the Specification, 
and to permit persons to whom the Specification is furnished to do so, 
subject to the condition that the foregoing copyright notice and this 
permission notice shall be included in all copies or substantial 
portions of the Specification. Unless separate permission is granted, 
modified works that are redistributed shall not contain misleading 
information regarding the authors, title, number, or publisher of the 
Specification, and shall not claim endorsement of the modified works by 
the authors, any organization or project to which the authors belong, or
 the XMPP Standards Foundation.

Disclaimer of Warranty

NOTE WELL: This Specification is provided on an "AS IS" BASIS, WITHOUT 
WARRANTIES OR CONDITIONS OF ANY KIND, express or implied, including, 
without limitation, any warranties or conditions of TITLE, 
NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. 


Limitation of Liability

In no event and under no legal 
theory, whether in tort (including negligence), contract, or otherwise, 
unless required by applicable law (such as deliberate and grossly 
negligent acts) or agreed to in writing, shall the XMPP Standards 
Foundation or any author of this Specification be liable for damages, 
including any direct, indirect, special, incidental, or consequential 
damages of any character arising from, out of, or in connection with the
 Specification or the implementation, deployment, or other use of the 
Specification (including but not limited to damages for loss of 
goodwill, work stoppage, computer failure or malfunction, or any and all
 other commercial damages or losses), even if the XMPP Standards 
Foundation or such author has been advised of the possibility of such 
damages.