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To get the best from this Mod you should be running PHP4 and have the zlib module installed and loaded. It is quite common for zlib to be installed by default. If you are unsure whether it is please check with your hosting provider or review the output of phpinfo();. This Mod does not require GD, Imagemagick, NetPBM or any other module or utility. If you do not have zlib available the Mod will fall-back to a simpler output method. However this will still deter the majority of would be trouble makers.