The man who halted the University Boat Race has been told to avoid several public events including the Olympic torch relay.
British Olympic Association chairman Lord Moynihan has said that security chiefs "can never completely remove" the threat of disruption.
The 158th University Boat race had to be halted after a protester swam towards the boats.
Security is going to be stepped up at this year's University Boat Race.
The London Royal Marines Reserve will provide a visible, unarmed presence on the river.
It comes after last year's race, when protester Trenton Oldfield swam into the paths of the crews.
Boat race protester Trenton Oldfield has abandoned his bid to win a cut in his six-month jail sentence, it was disclosed today.
Oldfield, who swam into the paths of the crews in this year's race, was due to appeal against the length of his sentence in the Court of Appeal next week.
A Judicial Office spokeswoman confirmed that Oldfield, of Myrdle Street, east London, had withdrawn his application.
Millions of television viewers watched as Oldfield, who was also ordered to pay £750 costs, halted the annual race on the Thames between Oxford and Cambridge universities on April 7.
He was found guilty of causing a public nuisance and sentenced by Judge Anne Molyneux.
The judge said Oldfield had acted dangerously, disproportionately, had not shown what he was actually protesting against, and displayed prejudice in sabotaging the event which Oldfield regarded as elitist.
A man who swam into the path of the University Boat Race has been sentenced to six months in prison for causing a public nuisance.
The judge said Trenton Oldfield had acted dangerously and disproportionately, and had not made it clear what he was protesting against. Mr Oldfield had claimed the event was elitist.
Trenton Oldfield, who disrupted this year's Boat Race was sentenced to six months in jail.
Trenton Oldfield, who disrupted thisyear's Boat Race by swimming into the path of the crews on the Thames, wastoday sentenced to six months in jail at Isleworth Crown Court after he wasconvicted of causing a public nuisance.
A man who disrupted this year's University Boat Race by swimming into the path of the rowers is due to be sentenced for causing a public nuisance.
Trenton Oldfield, 36, told the court that he wasprotesting against government elitism.
He's been warned he could face a jail sentence.
Trenton Oldfield, 36, was today found guilty at Isleworth Crown Court of causing a public nuisance after disrupting the Boat Race on April 7th this year, by swimming into the path of the crews.
The trial begins later of a swimmer accused of disrupting this year's boat race by swimming in the River Thames. Trenton Oldfield has pleaded not guilty to a charge of causing a public nuisance.
The race was stopped on 7th April when the Oxford and Cambridge boats were side by side near Chiswick Eyot, London. It was the first time in history the boat race was disrupted by a swimmer. The race was restarted nearly half an hour later. Cambridge went on to win after Oxford broke an oar.
Trenton Oldfield, who tried to disrupt the Oxford-Cambridge Boat race by swimming in front of the boats, is due in court later today.
He's charged under the Public Order Act.
He's claimed that he was protesting against elitism.
Paul Brand reports on the magistrates hearing in Feltham where Trenton Oldfield was told he will face a Crown Court trial on charges of causing a public nuisance.