cups dbus notifier launch lot of process

I saw that cups dbus notifier launch lot of process (30 process), is it normal ?
I'm using Ubuntu 12.04 X86_64.

$ ps aux | grep "/usr/lib/cups/notifier/dbus"
lp 1114 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1115 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1117 0.0 0.0 52128 1700 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1118 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1119 0.0 0.0 52128 1700 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1120 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1122 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1123 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1124 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1125 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1126 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1127 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1128 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1129 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1130 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1131 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1132 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1133 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1134 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1135 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1136 0.0 0.0 52128 1700 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1137 0.0 0.0 52128 1700 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1138 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1139 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1140 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1141 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1142 0.0 0.0 52128 1692 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1143 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1144 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://
lp 1145 0.0 0.0 52128 1696 ? S 09:41 0:00 /usr/lib/cups/notifier/dbus dbus://