Ad-targeting system Phorm must be "opt in" when it is rolled out, says the Information Commissioner Office (ICO)European data protection laws demand that users must choose to enrol in the controversial system, said the ICO in an amended statement.
The decision could be a blow to Phorm which before now has said it would operate on an "opt out" basis.
The ICO will monitor the trials and commercial rollout of Phorm to ensure data protection laws are observed.
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