The data was harvested from home wireless networks as Street View cars photographed neighbourhoods between 2008 and 2010.
In April, Google claimed that its Google Street View cars did not collect or store information sent over Wi-Fi networks.
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Street View cars, used to collect data for location-based products like Google Maps, mistakenly collected samples of payload data from unencrypted Wi-Fi networks.
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It was created after mistakes on privacy including the company's Street View cars collecting personal data as they captured images of street scenes.
Since 2008, the firm's Ground Truth project has mashed together licensed data with information gathered by its own fleet of Street View cars and bicycles.
In 2010, Google fell foul of governments, privacy watchdogs and users when it emerged that Street View cars copied e-mails and passwords from private wi-fi networks.
Moreover, the Swiss court said that Google had to print notice of the routes its Street View cars would be taking in local newspapers in advance.
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The Street View cars have been roaming Britain, refreshing the coverage in the big cities and bringing new images to remote places, such as the Isle of Lewis.
Although the Street View cars have been spotted in many places in the UK Google has yet to reveal when pictures will be added to maps of the country.
Street View cars, snowmobiles, trolleys and tricycles mounted atop boats and trains have captured 20 petabytes of images with high-resoulution, 360-degree cameras that resemble soccer balls, he said.
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Google said on Friday it had not kept its promise to delete all the personal data, such as emails, its Street View cars collected in Britain and other countries in 2010.
After a series of restrictions the Germans placed on Street View including giving people the right to have their houses blacked out on Google maps Google decided to stop driving its Street View cars around Deutschland.
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The British government and privacy advocates have long been concerned about the personal data Google may have collected when its Street View cars drove around the country taking pictures for the service, which shows panoramic photographic views from street level.
In a blog post dedicated to how the company is going to step up its privacy practices, Google revealed what exactly its Street View cars accidentally collected when they downloaded data from open, nonencrypted WiFi networks, notably passwords and emails.
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Not everyone will be comfortable with Google extending its reach this way, particularly in light of the fact its Street View cars collected users' emails, passwords and other personal data for more than two years before the practice was put to a stop.
After the Wi-Spy Street View snafu, Google stopped mapping Wi-Fi spots with its Street View cars, instead mapping them using geolocation feedback from Android phones. (Apple does something similar with the iPhone.) Moving forward, though, Google will let Wi-Fi hotspot owners opt not to be included on the map.
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Given that less than three months have passed since Google admitted that it had accidentally collected data from thousands of Wifi networks with its Street View cars, and that it still faces a legal probes in more than three dozen states, this is probably not a new toy that the company needs.
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That decision, the first of its kind, was handed down late Wednesday by a Silicon Valley federal judge presiding over nearly a dozen combined lawsuits seeking damages from Google for eavesdropping on open Wi-Fi networks from its Street View mapping cars.
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The search firm says that an experimental software project designed to gather data from unencrypted Wi-Fi networks was accidentally rolled out along with its Street View initiative, which uses cameras mounted on cars to film streets and buildings.
Google, for example, currently hires drivers to operate cars that collect images and data for its Street View mapping product.
Nevertheless, it says, Street View managers told the agency they didn't learn the Google cars were collecting the personal information until 2010.
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