Howdy, I have reviewed draft-ietf-cose-type-header-parameters as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. The summary of the review is ready (but I do have a question). The draft defines the typ (type) header to COSE to parallel the header parameters defined by JOSE, this will permit "explicit typing" of JSON Web Tokens. The draft is very simple and straightforward and there aren't really any issues but I was unable to parse this sentence from section 2:     "This parameter is ignored by COSE implementations; any     processing of this parameter is performed by the COSE     application." I'm not sure what the authors are trying to say here. Applications of COSE represent an implementation of COSE, right? So it can't be both ignored and processed. Or can it? What am I missing?   regards,   Dan. -- "The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." -- Marcus Aurelius