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3.6.2. Skype
Skype is another softphone that can be used on Ubuntu to make calls over the Internet. The source code of Skype is proprietary, but the software is free to use. Your calls go through distributed servers and not through a central server. To accomplish this, Skype uses a decentralized peer-to-peer technologies and its own proprietary communication protocol. Skype uses encrypted communication, which means all communications are encrypted from end-to-end so that others cannot listen in. We will not go into detail over Skype communication here.