Image processing apparatus, control method, and computer-readable storage medium for computer program

An image processing apparatus performs specific processing on images read out of a document having pages as follows. Each of the pages is a member assigned to at least any one of groups. The apparatus determines a second security level of each group based on a first security level of each page of the corresponding group; before the specific processing on the N-th group, determines whether or not password entry is necessary based on the second security level of the N-th group and any of the second security levels of the first group through the (N−1)-th group; and performs the specific processing on the N-th group if it is determined that password entry is unnecessary for the N-th group, or, alternatively, if it is determined that password entry is necessary for the N-th group and if a password is appropriately entered.