Canon CLC5151 Reference Manual page 339

To print pattern on the background of copy, select the background pattern from the Background
Pattern drop-down list.
You can select [Small] (36 pt.), [Medium] (54 pt.), or [Large] (72 pt.) for the size of the text.
To print the characters vertically across the page, press [Print Characters Vertically].
To use white letters on a coloured background, press [White Letters on Colored Backgnd].
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Forced Secure Watermark Mode