| 摘要 |
<p>Security is provided to a franking impression (27, 29) printed on mail items by including a multi-character code (31, 32, 34) in the franking impression. The multi-character code includes a two digit code (32) derived from a security key and a postage charge for an item, a two digit code (34) derived from the postage charge for the item and the date of franking and a four digit item count (31). <IMAGE></p> |
