All printed Ordnance Survey maps remain Crown Copyright. This means that before photocopying or duplicating an OS map printed from Promap, you must purchase an Ordnance Survey Paper Map Copying Licence.
Once you have purchased an OS licence subsequent OS map prints from Promap made within the 12 month licence period will incur no further charge. You can also photocopy maps.
All Detail maps printed through Promap include a 12 month licence. Once that period has ended, if you wish to print the map again you will be charged.
See also
Using the Ordnance Survey Paper Map Copying Licence