A Chinese company has apparently cracked the code behind Skype's VoIP calling service. From ZDNet's article, "Has Skype Been Cracked?":
Skype's model of being a communications island could be under threat, if reports that its voice and instant messaging client has been successfully reverse engineered are true.
According to Charlie Paglee, the chief executive of a Chinese-American Internet telephony (VoIP) company called Vozin Communications, engineers from a small Chinese startup have managed to crack Skype's protocol.
Writing on his VoIPWiki blog on Thursday, Paglee claimed he had been made aware of the development when a member of the team successfully called him on his Skype account from another VoIP client.
The article goes on to say that the introduction of a Skype clone could disrupt future revenues from ad based services. Skype was bought out last year by Ebay, who hoped to incorporate the novel communications service into their online auction/commerce business.