sentence: Most governments still put seals on important documents.
sentences_before: A seal could be put on the letter itself, or on the envelope where it is stuck down. This meant that no one would be able to open the letter and then close it again, because the seal will break when the letter is opened.
sentences_after: Letters do not normally have seals any more, even important letters.
concept_name: government
headings: Seal (device) Impression
categories: Authentication methods Writing