Pope Benedict's decision to live in the Vatican after he resigns will provide him with security and privacy. It will also offer legal protection from any attempt to prosecute him in connection with sexual abuse cases around the world, Church sources and legal experts say.

"His continued presence in the Vatican is necessary, otherwise he might be defenseless. He wouldn't have his immunity, his prerogatives, his security, if he is anywhere else," said one Vatican official, speaking on condition of anonymity.

"It is absolutely necessary" that he stays in the Vatican, said the source, adding that Benedict should have a "dignified existence" in his remaining years.