David 'TheRaven' Chisnall wrote: [...]
This would prevent people from easily sending a large number of spam Jabber messages, although it would have a couple of limitations:
Blind people obviously can not see an image, and so could not recognise it. An alternative, such as a wave sound of someone saying a word / phrase or number could be used in place. This then leaves us with the problem of blind and deaf people, who, presumably are using some kind of braille terminal. It would be very difficult to create something which can be recognised by someone using a braille terminal but not a computer.
Low bandwidth devices and terminal based clients may also be unable to respond to this kind of identification.
[..]
Indeed, I didn't thought of this disadvantages :(...
Regards, Mattias
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