John, Thank you for your comments of 08 Jul 2016 in reply to Phillip Hallam-Baker’s message. See https://mailarchive.ietf.org/arch/msg/ietf/yKbjLYUcxHHdj63PbrWbte12jBE See “History” (application/pdf was first registered in 93) “Security Considerations” (it wasn’t a surprise) and “Adobe PDF vs ISO Specs” (technically identical per Fast Track rules) Larry -- http://larry.masinter.net