Surely you have gotten emails or seen brochures from crappy companies who claim to be ONVIF conformant, even though they are not found on the ONVIF official list [link no longer available]. Or worse, two 'officially' conformant products have failed to work together.
You may wonder to yourself, "How can this be?"
And the more skeptical of you might even think, "Why would ONVIF allow this? Are they just uninterested in policing or protecting their own standard?"
Alas, you would be correct and here it is from the Chairman himself.