1. An image processing apparatus for generating image data having a dot image used to suppress information leakage, comprising: a generation unit configured to composite a first dot image which is visually recognizable on a copied material and includes a latent image and a background image used to suppress information leakage, and a second dot image embedded with information used to suppress information leakage to generate a third dot image including the latent image and the information used to suppress information leakage; and an image data generation unit configured to generate image data having the third dot image by compositing the third dot image and predetermined image data.