RM4SCC barcodes are used by the Royal Mail in the UK. Valid characters are:0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ( )The package contains Type 1 and TrueType versions.System Requirements:Any PC running Windows 98 or later including Vista.