Skype is a high-quality encrypted Internet telephony system that allows for the exchange of files, interconnects with the public switched telephone system. CSOs should know that the system’s security is impossible to audit, and the vendor refuses to disclose details on security features. Despite their similarities, Skype does not come with Kazaa’s baggage. For organizations such as investment companies that are required by law to monitor communications between their employees and customers, Skype is an untappable voice gateway.”]
Source: https://www.csoonline.com/article/2117960/skype-risks–can-9-million-skype-users-be-wrong-.html