Introduction to RTMFP

• Author: 柳大·Poechant
• Blog:blog.csdn.net/poechant
• Email: [e-mail]
• Date: April 16^th, 2012

1 What is RTMFP?

The SecureReal-TimeMediaFlowProtocol (RTMFP) is a proprietary protocol suite developed by Adobe Systems forencrypted, efficient multimedia delivery through bothclient-serverandpeer-to-peermodels over the Internet.

2 What is the difference between P2P of sharing files and P2P of real-time communication?

RTMFP is a peer-to-peer system, but is only designed for direct end user to end user communication for real-time communication, not for file sharing between multiple peers using segmented downloading.[1] Facebook uses this protocol in its Pipe application to transfer big files directly between two users.

3 What transportation protocol is RTMFP based on?

RTMFP is based on User Datagram Protocol (UDP).

4 What is the difference between RTMFP and RTMFP

RTMP stands for Real-Time Messaging Protocol, and RTMFP stands for Real-Time Media Flow Protocol.

• RTMFP is based on User Datagram Protocol (UDP), whereas RTMP is based on Transmission Control Protocol (TCP).
• Unlike RTMP, RTMFP also supports sending data directly from one Adobe Flash Player to another, without going through a server.

5 Does Flash Player support RTMFP?

Flash Player 10.0 allowed only one-to-one communication for P2P, but from 10.1 application-level multicast is allowed. Flash Player finds appropriate distribution route (overlay network), and can distribute to the group, which is connected by P2P.

6 Does Cumulus require Cirrus key?

NO! Of course, it’s Cumulus’s main goal: be an cirrus GPL alternative. The only limit: your CPU, memory, and number of ports on one machine.

7 Is this thing legal?

It is legal in the US under the Digitial Millenium Copyright Act. You can drill the thread on WikiPedia:

http://en.wikipedia.org/wiki/Real_Time_Media_Flow_Protocol - http://en.wikipedia.org/wiki/Proprietary_protocol - http://en.wikipedia.org/wiki/Digital_Millennium_Copyright_Act

“There are legal precedents when the reverse-engineering is aimed at interoperability of protocols.[7][8][9] In the United States, the Digital Millennium Copyright Act grants a safe harbor to reverse engineer software for the purposes of interoperability with other software”

Reference

1. http://en.wikipedia.org/wiki/Real_Time_Media_Flow_Protocol
2. http://groups.google.com/group/openrtmfp-cumulus/browse_thread/thread/c91d0f07fea2967e
3. http://forums.adobe.com/message/3570224

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