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Mr Edis told the court that Mrs Brooks personally authorised payments to an MoD official via a Sun journalist.
He said the only reason for the payments was to make sure the Sun got the story first and some involved the reporting of the deaths of members of the armed forces.
"Sometimes these payments were about things coming into public domain anyway," he added.
"In which case there was no good reason at all for the MoD source to accept money to leak them early. The only advantage of that was that the Sun would get the exclusive.
"It may concern the death of an active serviceman... it really matters when it is released and how it is released to other people affected by it."
Mr Edis said: "Mrs Brooks was involved in a conspiracy to commit the criminal offence of misconduct in a public office - and she knew it."
Mrs Brooks denies conspiracy to phone hack, misconduct in public office, and perverting the course of justice.
The court has heard that three former News of the World journalists, who are not on trial, as well as Mulcaire, had pleaded guilty to phone-hackin g
www.bbc.co.uk/news/uk-24775846