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From - RFC2026 -

ftp://ftp.isi.edu/in-notes/rfc2026.txt

The following copyright notice and disclaimer shall be included in all ISOC standards-related documentation:

"Copyright The Internet Society (date). All Rights Reserved.

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.

The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.

From RFC2223

ftp://ftp.isi.edu/in-notes/rfc2223.txt

11. Copyright Section

Per BCP 9, RFC 2026 [2], "The following copyright notice and disclaimer shall be included in all ISOC standards-related documentation." The following statement should be placed on the last page of the RFC, as the "Full Copyright Statement."

"Copyright The Internet Society (date). All Rights Reserved."

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into Postel & Reynolds Informational [Page 11] RFC 2223 Instructions to RFC Authors, October 1997, languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an "as is" basis and the Internet Society and the Internet Engineering Task Force disclaim all warranties, express or implied, including but not limited to any warranty that the use of the information herein will not infringe any rights or any implied warranties of merchantability or fitness for a particular purpose.