Open protocol

Open protocol or open communication protocol is communication protocol. It is is openly accessible and usable by anyone. Use of open protocols is not restricted. Their specification are licensed with open license. The difference between open and closed protocol is that closed protocols are usually designed by a small group of people who can restrict the use of the protocol and change it in whatever way they want . Open protocols are usually designed by a large number of people. This makes the protocols more general and suitable for more uses.
Examples of open protocols: