AMQP version 0-9

amqp0-9.pdf: AMQP 0-9 Specification (PDF)
amqp-xml-doc0-9.pdf: AMQP 0-9 Protocol Documentation (PDF)
amqp0-9.xml: AMQP 0-9 Protocol Definitions (XML)
amqp0-9.stripped.xml: AMQP 0-9 Protocol Definitions (XML - BSD-style license, structure only)

These specifications are published Under the AMQP License, unless otherwise stated.
That license can be found at the beginning of the PDF file.