The court has spent an unhurried three-and-a-half years pondering this, since Spain's opposition People's Party first challenged the charter.
ECONOMIST: Catalonia is set to have a big role in Spain??s politics
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The deputy prime minister told his weekly LBC radio phone-in that "what people have dubbed the snooper's charter" was "not going to happen".
BBC: A person using a computer
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"What we are trying to do is not make this a 'Eurosceptic's charter' but try to attract people from across the political spectrum, " Mr Baron told BBC News.