Lawsuit filed in San Francisco district court after firms resurrected deleted browser cookies.
…A legal challenge has been launched in the US against a number of websites amid claims that they were engaged in “covert surveillance” of users.
The lawsuit alleges that a number of firms, including Hulu, MTV, and Myspace, used a Quantcast Flash application to restore deleted cookies.
Cookies are text files used by web browsers to store user data.
The lawsuit says that the application was creating so-called “zombie cookies” from deleted files.
Quantcast has not responded to a BBC News request for comment.
The term “zombie cookie” was coined after the issue of traditional browser cookies being undeleted by Flash was brought to light in a 2009 paper by US researchers.
The study found that more than half of sites surveyed used flash cookies to store information about the user, with some using it to “respawn or re-instantiate cookies deleted by the user”.
“Flash cookies often share the same values as browser cookies, and are even used on government websites to assign unique values to users,” the paper…
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Legal action on Zombie Cookies filed in US court