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Free software and telephony over IP
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Free software and telephony over IP


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  • 1. Logiciels libres en téléphonie sur IP: Pièges & menaces
  • 2. Rappel: GPL v2 “To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it.” - Preamble, GPL v2.1
  • 3. Menaces
  • 4. Brevets
      • EP-1114414
      • EP-1224659
      • EP-1058927
      • EP-1008141
      • EP-877355
      • EP-503684
      • EP-0516621
      • EP-819303
      • EP-813736
  • 5. Brevets
      • EP-1114414: Adaptive Combining of Multi-Mode Coding for Voiced Speech and Noise-Like Signals
    AMR: Brevet logiciel
  • 6. Standards bodies ITU ISO/IEC
  • 7. “ The Contributor grant a perpetual, irrevocable, non-exclusive, royalty-free, world-wide right and license to the ISOC and the IETF under all intellectual property rights in the Contribution: (e) to extract, copy, publish, display, distribute, modify and incorporate into other works ... any executable code or code fragments that are included in any IETF Document ... subject to the requirements of Section 5 (it also being understood that the licenses granted under this paragraph (E) shall not be deemed to grant any right under any patent, patent application or other similar intellectual property right disclosed by the Contributor under RFC3979).
  • 8. “ RAND” “ the originator shall ask any holder of such identified patent rights for a statement that the holder would be willing to negotiate worldwide licences under his rights with applicants throughout the world on reasonable and non-discriminatory terms and conditions” ISO/IEC IPR policy
  • 9. Interoperability requires iLBC “ iLBC codec is standardized by IETF (RFC3951 and RFC3952) and is designated by CableLabs as a mandatory component of all voice-over-cable telephony systems.”
  • 10. Interoperability requires iLBC
    • Personal, non-commercial use is generally permitted.
    • Commercialization is permitted with certain limitations; for example, to ensure that every iLBC decoder can decode every iLBC-encoded payload, commercial “Deployment” must comply with the applicable IETF Standard/draft, and the format of the bitstream may not be modified.
    • You are provided no warranty or support, and all liability is disclaimed.
    • You must register this license with GIPS prior to any commercial Deployment.
  • 11. Danger
  • 12. All that glitters is not gold
  • 13. Source code != Libre
  • 14. Les sources iLBC font partie du standard Une implémentation AMR disponible en bibliothèque:
  • 15. Protocoles propriétaires
  • 16. Espoir
  • 17. Protocoles, codes ouverts
  • 18. mais...
  • 19. Utilisation des codecs ouvert entre logiciels libres Implémentation de codecs compatibles GPL Interoperabilité à tout prix
  • 20. FIN