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"We understand that governments have a duty to protect their citizens. But this summer's revelations highlighted the urgent need to reform government surveillance practices worldwide," the group said in an open letter published on its website.
"The balance in many countries has tipped too far in favour of the state and away from the rights of the individual - rights that are enshrined in our Constitution.
"This undermines the freedoms we all cherish. It's time for a change," it added.