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Skype Network Administrator’s Guide Skype 3.0 Beta 22

2006-10-31 Document version 2.0 Beta

Where Does Skype Store Data?

Skype maintains information about users in the following locations: the Skype central

authentication server, Skype account and transaction servers, a Skype event server, the

global index in the Skype P2P network cloud on the Internet, a Skype users’ computer, and

other Skype users’ computers.

• A Skype user’s computer stores the installed version of the Skype client, any residual

copies of Skype installation files that have not been deleted, Windows registry keys,

profile information (including email address), voicemail message files that have been

delivered, call logs, chat logs, and a set of configuration files that may include the Skype

names of people in a given user’s contacts list. Chat logs are saved indefinitely in hidden

directory under the user’s home directory by default unless a user intentionally deletes

them. The Skype client can be configured to delete or expire.

Important note: Trace bits of information related to one Skype user might be found on

another Skype user’s computer. This type of information may include voicemail messages

that have been received or not yet been sent, IM’s that have not been sent and/or chat

histories.

• The Skype central authentication server stores data about all valid Skype users. This

database does not accept queries from any non-Skype source. Specifically, it stores

Skype name, a copy of the e-mail address that was originally provided during

registration, and a one-way encrypted hash of each user’s password.

Skype maintains two references to each user’s email address, one is in the profile on the

Skype user’s computer. The other is stored in My Account on the Skype website for

password recovery. As a result, if the email address changes, it should be updated in

both the user’s Skype client profile and the Skype website.

• Skype account / transaction servers capture statistics about Skype calls as well as order

and transaction data for the purpose of operating the Skype service.

Skype-to-Skype traffic data is collected only in the aggregate. Skype Technologies S.A.,

does not track information about which users are communicating with one another over

the Skype network or the duration of these interactions. However, information about

SkypeIn and SkypeOut calls is collected and processed to manage the business. If a user

has SkypeOut credit, information about the calls they place is collected to maintained in

their account balance. For a detailed explanation of how this data are used, please refer

to the Skype Terms of Service, which is available on the Skype Web site.

• The Skype event server is a database that Skype utilizes as a cache to store temporarily a

copy of certain types of information until the information is no longer needed; in other

words, to ensure that the information is delivered reliably. In general, Skype

Technologies S.A., does not maintain copies of information.

• The global index stores each user’s computer’s last network address, the network

address, each Skype client’s supernode, and each user’s current Skype user profile. All

profile data in the public directory is digitally signed.

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Skype - 3.0 beta Guide de l'utilisateur Page 22