Google must divulge the viewing habits of every user who has ever watched any video on YouTube, a US court has ruled.
The ruling comes as part of Google's legal battle with Viacom over allegations of copyright infringement.
Digital rights group the Electronic Frontier Foundation (EFF) called the ruling a "set-back to privacy rights".
The viewing log, which will be handed to Viacom, contains the log-in ID of users, the computer IP address (online identifier) and video clip details.
BBC linky.
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