Mr Swirski says the new system, which also searches Facebook and Twitter profiles, will compile a database of people using such language in order to judge whether incidents are slips of the tongue or "deliberate attempts to defame Poland". He acknowledges that the former is often the case, particularly when material has been copied from elsewhere. But the stakes are rising since the right-wing government introduced a bill to make implying Polish responsibility for Nazi atrocities a criminal offence, punishable by up to three years in jail.