Under the default (Section 17) arrangements, in other words, it would continue to be possible to convict people for a 2012 Act offence for an indefinite period after the Act was repealed, so long as the behaviour that constituted the offence took place before the date of its repeal. Under section 2(1), by contrast, a person who carried out behaviour of the sort criminalised by the 2012 Act can, from the date the repeal takes effect, no longer be convicted of a 2012 Act offence.