An image retrieval system that provides secured image data in response to a query specified by a user. The system includes a data retrieval unit, an encryption unit, and an output unit. The data retrieval unit is configured to retrieve image data relevant to the specified query from a collection of image data. The encryption unit is configured to encrypt at least a portion of the retrieved image data according to the specified query. The output unit is configured to output the at least partially encrypted image data to the user. The image data represents an image formed of one or more regions each having a keyword associated therewith. The encrypted portion is decryptable by the user only when the user is authorized to view the entire image.