Pitney Bowes DM1000 - Manual (Page 157)

11-4 SV60951 Rev. A
11 Supplies and Options
Sample Permits
A permit is a postal mark which indicates that you have a
special account at the Post Office which allows you special
rates. If you use a permit on your mail, you do not need to
apply postage.
You can order mailing supplies from the USPS for use with mailing
system by visiting the USPS Shipping Supplies Online web site. USPS
Supplies
Permits