Copying apparatus having determination unit for special original and for controlling copying and marking based on determination

A copying apparatus comprising:

• image reading means for optically reading an original and for outputting image signals corresponding to the original;
• image processing means for processing the image signals supplied from said image reading means in accordance with a predetermined method and for outputting image data;
• image forming means for forming an image corresponding to the image data supplied from said image processing means on a recording sheet;
• original determination means for determining whether a rank of certainty that the original is a predetermined special original is a first rank or a second rank lower than the first rank;
• prohibiting means for prohibiting the image corresponding to the original from being formed on the recording sheet when the determination result obtained by said original determination means is the first rank;
• information adding means for adding predetermined information to the recording sheet on which the image is formed by said image forming means when the determination result obtained by said original determination means is the second rank.