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.
While the legal battle between the two firms is being contested in the US, it is thought the ruling will apply to YouTube users and their viewing habits everywhere.
Viacom, which owns MTV and Paramount Pictures, has alleged that YouTube is guilty of massive copyright infringement.
The UK's Premier League association is also seeking class action status with Viacom on the issue, alleging YouTube, which was bought by Google in 2006, has been used to watch football highlights.
Legal action
When it initiated legal action in March 2007 Viacom said it had identified about 160,000 unauthorised clips of its programmes on the website, which had been viewed more than 1.5 billion times.
Following the launch of its billion-dollar lawsuit, YouTube introduced filtering tools in an effort to prevent copyright materials from appearing on the site.
We urge Viacom to back off this overbroad request
Electronic Frontier Foundation
Q&A: What does this ruling mean?
Send us your comments
The US court declined Viacom's request that Google be forced to hand over the source code of YouTube, saying it was a "trade secret" that should not be disclosed.
But it said privacy concerns expressed by Google about handing over the log were "speculative".
Google's senior litigation counsel Catherine Lacavera said in a statement: "We are disappointed the court granted Viacom's over-reaching demand for viewing history.
"We will ask Viacom to respect users' privacy and allow us to anonymise the logs before producing them under the court's order."
The ruling will see the viewing habits of millions of YouTube users given to Viacom, totalling more than 12 terabytes of data.
Viacom said it wanted the data to "compare the attractiveness of allegedly infringing video with that of non-infringing videos."
YouTube and Google had "compelled" it to go to court, Viacom said, "by continuing to defend their illegal and irresponsible conduct and profiting from copyright infringement, when they could be implementing the safe and legal user generated content experience they promise".
It said it would not be asking for any "personally identifiable information" of any user.
"Any information that we or our outside advisors obtain will be used exclusively for the purpose of proving our case against You Tube and Google (and) will be handled subject to a court protective order and in a highly confidential manner."
'Erroneous ruling'
Leading privacy expert Simon Davies told BBC News that the privacy of millions of YouTube users was threatened.
The chickens have come home to roost for Google
Simon Davies, privacy expert
He said: "The chickens have come home to roost for Google.
"Their arrogance and refusal to listen to friendly advice has resulted in the privacy of tens of millions being placed under threat."
Mr Davies said privacy campaigners had warned Google for years that IP addresses were personally identifiable information.
Google pledged last year to anonymise IP addresses for search information but it has said nothing about YouTube data.
Mr Davies said: "Governments and organisations are realising that companies like Google have a warehouse full of data. And while that data is stored it is under threat of being used and putting privacy in danger."
The EFF said: "The Court's erroneous ruling is a set-back to privacy rights, and will allow Viacom to see what you are watching on YouTube.
"We urge Viacom to back off this overbroad request and Google to take all steps necessary to challenge this order and protect the rights of its users."
The body said the ruling was also potentially unlawful because the log data did contain personally identifiable data.
The court also ruled that Google disclose to Viacom the details of all videos that have been removed from the site for any reason.
My New Blog
July 3, 2008
ALERT: YOUTUBE USERS COMPROMISED!
July 1, 2008
British Health Records Stolen
This is really beginning to get to me. With the proliferation of laptops in our society, you would think that knowledge of security would begin to rapidly spread as well. However, this is the second story in less than a week of a laptop being stolen from a car. Now, if this was an office of some sort, with semi-inconsequential data it would be understandable. But it seems that more and more, Healthcare IT staff are carrying around patient data on their personal laptops. These are people who are carrying around credit card info, banking numbers, social security numbers, Names, dates of birth. And i still wouldn't have a problem with it if they would take some sort of rudimentary precautions to ensure the protection of the data. However, there have been cases of IT staff storing full system backup tapes, laptops, USB Crypto keys, and entire servers in the back of their cars. They are then completely amazed when these top-level security measures are thwarted by a crook with a crowbar. This latest incident occured after a British IT worker for the NHS trust left his laptop unsecured in his car, along with 21,000 patients details. To make things worse, none of the information was encrypted. So the thief now has complete access to any and all patient data. The NHS trust reinforced the now common perception that they were completely technologically incompetent by stating (trying to make the situation better) "the data will almost certainly by wiped by the thief"
What steps should you take in order to secure a system from theft?
A. Set a Bios Level Password
B. Set at least a 14 digit password.
C. Require some sort of Biometric Authorization for Access
D. Always keep your data in an encrypted folder
E. If practical, Hide private data inside of another file
F. Keep any backups in humidity controlled, insulated environment.
G. Rule of Thumb: If your system can be seen, its public data.
H. Thumb of Rule: If your system is in your car, it deserves to be stolen.
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Labels: backdoor, backups, Biometric, Bios, Britain, data, doctor, Gillis Jones, Hack Stole, Healthcare, hospital, IT, Laptop, Leo Laporte, NHS Trust, Password, patients, Security, Stolen, theft