During the recent F-to-F meeting and re-reading the current cloud use-cases, I didn't see a use-case for accessing 3rd-party web site content to print "from" - an example being…
Alice has a photo album stored on Flickr.com. She wants to print one or more of her pictures from her Flickr album on a particular cloud printer. This is similar to the print-by-reference case, in that Alice will probably specify a URL (URI) to print "from". However, the cloud service will have to authenticate on behalf of Alice to access her photo album (by reference), and Alice must not reveal her Flickr authentication credentials to the cloud service.
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