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Officially...
“Shibboleth is an initiative to develop an open, standards-based solution to the needs for organizations to exchange information about their users in a secure, and privacy-preserving manner.”
 
http://shibboleth.internet2.edu/shib-intro.html 
 
(emphasis mine)
 
Notes:
Shibboleth was (and is) developed by Internet2 in the US. This is one of the definitions of the Shibboleth project taken from their web site. 
Note the underlined bits:
open
standards-based
for organisations to exchange information
secure
privacy-preserving