In England and Wales, the imprisonment for public protection (IPP) sentence was a form of indeterminate sentence introduced by s.225 of the Criminal Justice Act 2003 (with effect from 2005) by the Home Secretary, David Blunkett, and abolished in 2012. It was intended to protect the public against criminals whose crimes were not serious enough to merit a normal life sentence but who were regarded as too dangerous to be released when the term of their original sentence had expired. It is composed of a punitive "tariff" intended to be proportionate to the gravity of the crime committed and an indeterminate period which commences after the expiration of the tariff and lasts until the Parole Board judges the prisoner no longer poses a risk to the public and is fit to be released. The equivalent