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Proprietary protocol

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Title: Proprietary protocol  
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Subject: Comparison of remote desktop software, Remote desktop software, Instant messaging, DASS1, Independent Computing Architecture
Collection: Network Protocols
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Proprietary protocol


  1. ^ Proprietary protocol Definition — PC Magazine Encyclopedia
  2. ^ Which protocols does Skype use? — “Help for Skype”
  3. ^ Microsoft Exchange Server Protocols
  4. ^ Microsoft Open Protocols
  5. ^ Instant messaging: This conversation is terminated — BBC News
  6. ^ "Microsoft’s Kerberos shuck and jive". 2000-05-11. 
  7. ^ Sega vs Accolade, 1992
  8. ^ Sony vs Connectix, 2000
  9. ^ Pamela Samuelson and Suzanne Scotchmer, “The Law and Economics of Reverse Engineering”, 111 Yale Law Journal 1575–1663 (May 2002)
  10. ^ 17 U.S.C. Sec. 1201(f).
  11. ^ WIPO Copyright and Performances and Phonograms Treaties Implementation 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.[10][11]

Reverse engineering is the process of retrieving a protocol’s details from a software implementation of the specification. Methods of reverse-engineering a protocol include packet sniffing and binary decompilation and disassembly.

Reverse engineering

Microsoft developed a proprietary extension to the Kerberos network authentication protocol for the Windows 2000 operating system. The extensions made the protocol incompatible with implementations supporting the original standards, and this has raised concerns that this, along with the licensing restrictions, effectively denies products unable to conform to the standard access to a Windows 2000 Server using Kerberos.[6]

Proprietary extensions to open protocols

The use of proprietary instant messaging protocols meant that instant messaging networks were incompatible and people were unable to reach friends on other networks.[5]

Effects of incompatibility

Microsoft Exchange Server protocols are proprietary[3] open access protocols. The rights to develop and release protocols are held by Microsoft, but all technical details are free for access and implementation.[4]

The Venturi Transport Protocol (VTP) is a patented proprietary protocol (U.S. Patent 5,883,893) that is designed to replace TCP transparently in order to overcome perceived inefficiencies related to wireless data transport.

The Skype protocol is a proprietary protocol.[2]


Proprietors may enforce restrictions through patents and by keeping the protocol specification a trade secret. These restrictions are intended to give the owner control of the protocol.



  • Enforcement 1
    • Examples 1.1
  • Effects of incompatibility 2
  • Proprietary extensions to open protocols 3
  • Reverse engineering 4
  • References 5


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