I was surprised to see the line "No IPR declarations were found that
appear related to this I-D." in the message from ietf-announce. Its
predecessor, RFC3588, has a filed IPR disclosure from Nokia, see
A very long time ago, I looked into the patents in question, and they
seemed to be related to the T-Bit (Diameter message command flag for
"potentially re-transmitted message").
Page 35 in 3588bis still contains the T-Bit. As a naive non-legalese
person, I would think that the same disclosure that applied to the T-Bit
in 3588 also applies to the T-Bit in 3588bis then.
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