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Skype 2.2




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Skype is a software program created by the Swedish and Danish entrepreneurs Niklas Zennström and Janus Friis. Skype allows users to make telephone calls over the internet to other Skype users free of charge, or to landlines and cell phones for a fee.
Additional features include instant messaging, file transfer, short message service, video conferencing and its ability to circumvent firewalls.

The Skype Group, acquired by eBay in September 2005, has headquarters in Luxembourg, with offices in London, Tallinn, Tartu, Prague and San Jose, California. Skype experienced rapid growth in both popular usage and software development since the launch, of both its free and its paid services.

SkypeOut allows Skype users to call traditional telephone numbers, including mobile telephones, for a fee. This fee is as low as US$0.021 per minute for most developed countries, and as high as US$2.142 per minute for calls to the dependency of Diego Garcia.
Beginning January 2007, Skype also charges an equivalent of €0.039 for each SkypeOut call, in addition to the ordinary rate.
After 180 days of not making a SkypeOut call the Skype balance expires.
As of January 30, 2007, SkypeOut calls to Canada and
the United States are no longer free.

SkypeOut calls to most toll free numbers in France (+33 800, +33 805, +33 809), Poland: (+48 800), UK: (+44 500, +44 800, +44 808) and the United States and Canada: (+1 800, +1 866, +1 888 ) are free for all Skype users, even if they do not have the SkypeOut service.
However, for many other countries SkypeOut doesn't support calling toll-free and premium rate numbers, and SkypeOut doesn't support calling emergency numbers (such as 112 the Universal Emergency number for GSM mobile phones, 911 in Canada and the USA, 000 in Australia and 999 In the UK).

SkypeIn allows Skype users to receive calls on their computers dialed by regular phone subscribers to a local Skype phone number.
It permits users to subscribe to numbers in Australia, Brazil, Chile, Denmark, the Dominican Republic, Estonia, Finland, France, Germany, Hong Kong, Ireland, Japan, Mexico, New Zealand, Poland, Romania, Sweden,
Switzerland, UK, and the United States.

For example, a user in San Francisco could create
a local telephone number in Helsinki.
Callers from Helsinki would pay only local rates to call that number.
Some jurisdictions such as France and Norway, however, forbid the registration of their local telephone numbers to anyone without a physical presence or citizenship in the country.

First introduced in January 2006, Skype provides videoconferencing for Windows, Mac OS X and GNU/Linux (Skype 2.0 or above required).
With version 3.6.0.216 for Windows, Skype now supports “High Quality Video" with quality and features (e.g. full-screen and screen-in-screen modes) similar to those found in middle-range video-conferencing systems.

Secure communication is a feature of Skype.
The encryption cannot be turned on or off. The user is not involved in the encryption process and therefore does not have to deal with the issues of public key infrastructure.
Skype reportedly uses non-proprietary, widely trusted encryption techniques: RSA for key negotiation and the Advanced Encryption Standard
to encrypt conversations.

Skype provides an uncontrolled registration system for users: registration requires no proof of identity.
Although this permits users to use the system safely without revealing real-life identities to other users of the system, the lack of authentication means there is no guarantee that those communicated
with are who they say they are in real life.
The downside of this is that it is easy to use the personal name (but not identity) of a trusted person as a Skype nickname and trick a naive user into revealing information or executing a program sent to them.




Screenshots