"Because this will be of concern to many people—particularly in the open source community—it is worth pointing out one of the legal ramifications of Microsoft joining AMQP. There is a strong IP provision in the contract for joining the AMQP working group. Anyone joining the AMQP working group must freely license IP that is used by AMQP—AMQP is and will always be an open standard that is free to implement. By joining the AMQP working group, Microsoft has signed this contract. So, there is no threat of Microsoft holding the AMQP standard hostage via patent threats."