Just popped a little comment onto this Guardian article:
The issue may be simply resolved in the end, with evidence that former TV producer Mark Coop got his original copy from Barter Books and appears to have no evidence of original discovery; but the Keep Calm Campaign says that he has United States and Canadian applications pending and the potential may be growing for restrictive action. The slogan was originally Crown copyright but is now in the public domain because more than 50 years have elapsed since an unknown civil servant thought it up. Wouldn’t it be great if they or a relative came forward?
Its two predecessors ‘Your Courage, Your Cheerfulness, Your Resolution will Bring us Victory’ and ‘Freedom in Peril’ were plastered across the UK. But ‘Keep Calm and Carry On’ was stuck on only a few office walls and all but a handful of copies – most in the National Archive and the Imperial War Museum – escaped pulping.
Read full article.