"This ban directly attacks the fundamental liberties on which our open society and free press depends," said Christian Jensen, editor-in-chief of Politiken, the country's paper of record.
The Danish Security and Intelligence Service (PET) had obtained a provisional injunction yesterday from the Copenhagen district court against the publication of the book, fearing it could contain secrets.
The book, called "Seven Years for PET -- Jakob Scharf's Time" is based partly on interviews with the former spy chief and was due to go on sale from October 17 and be serialised in Politiken t.
Jensen said that "if the PET, without concrete evidence, can exert control on books, or media articles, then this suggests we have effectively accepted an intelligence agency as an authority on publication, which would hamper the freedom of the press. There is another word for that: censorship".
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The PET said it had only received a copy of the work on Friday and is now "undertaking a close reading of the book to determine if it contains information that could endanger operations or people," the agency's director Finn Borch Andersen said in a statement.
Daily Ekstra Bladet and Radio 24syv were also banned from covering the book's contents by a separate district court order.
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