I have encountered this sentence from a letter of 1822. If anyone can provide a translation of these five Latin words in the context they are used here I would appreciate it. The newspaper story alluded to is the unexpected death of the Duke of Gotha. It seems to me that a straight translation is not going to provide the real meaning the writer is trying to convey, so if I have to elaborate its meaning in a footnote that is fine. "There is another reason not to expect a retraction, for it is not possible that a German newspaper announces such information so definitely, cum dato et con sale if it were not true."