Abstract: There is described an image forming apparatus, which makes it possible to implement a high-speed printing operation based on print data attached with a digital signature. The apparatus comprises: a storage section to store print data; a, digital signature analyzing section to analyze a digital signature; a language analyzing section to analyze the print data; an image processing section to create bitmap data; a printing section to implement a printing operation; and a control section that selectively conducts either a first controlling operation or a second controlling operation.

Abstract: There is described a document data creating apparatus, a document data creating method and a program thereof, which make it possible to improve convenience of both the user and the creator of the document data by effectively utilizing the digital signature. The apparatus for creating document data that include a digital signature, includes: a character recognizing section to recognize a character based on image data inputted; a reliability determining section to determine a reliability degree of the character; a characteristic value calculating section to calculate a characteristic value of the document data; and a digital signature section to attach the characteristic value to the document data. When the reliability determining section determines that the reliability degree of the character is low, the digital signature section attaches a value, which is different from the characteristic value calculated by the characteristic value calculating section, to the document data as the digital signature.

Abstract: There is described an image forming apparatus, which make it possible to appropriately print each of a valid print object and an invalid print object. The apparatus includes: a printing section to conduct a printing operation based on the print data, so as to create the print product; and a control section to determine whether the digital signature is valid or invalid so as to control the printing operation, based on the determined result. When the plurality of print objects includes both a valid print object for which the digital signature is determined as valid and an invalid print object for which the digital signature is determined as invalid, the control section controls the printing operation, so as to enable the valid print object to be printed, based on the print data, while disable the invalid print object to be printed, based on the print data.

Abstract: Disclosed is an image forming apparatus including: a recording section which records job data including image data, and management information indicating a stored state of the job data and possible to be updated; and a control section which refers to the management information recorded in the recording section and executes image formation based on the job data when the stored state of the stored data is indicated to be normal.

Abstract: Disclosed is an image forming apparatus, comprising: an image processing unit to generate multivalued data from an object included in print data in which a rendering command specifies filling of the object with a pattern, the object being subject to filling in a uniform density in the multivalued data, and to generate a bit map data which reproduces a halftone in a pseudo manner with a screen pattern from the multivalued data; and an image formation control unit to form an image on a recording medium based on the bit map data.

Abstract: Disclosed is a print controlling device including a control unit to control printing according to an instruction which relates to the printing, wherein the control unit analyzes a page description language which relates to the printing, determines whether the printing is practically monochrome printing or color printing, and changes a first command of the page description language to a second command for monochrome printing when it is determined that the printing is monochrome printing.

Abstract: Disclosed is an image forming apparatus including: a memory section having a common storage area that temporarily stores a plurality of pieces of data having different forms from each other; and a control section configured to deem an area of data expected to be deleted among the plurality of data in the common storage area, as an empty area when checking whether data is allowed to be stored in the common storage area.

Abstract: An image forming apparatus including: a memory section having a common storage area that temporarily stores data in an intermediate form, which are generated on the way between image data in a form of page description language and data in a bitmap form obtained by interpreting the image data, and the data in a bitmap form; and a control section configured to monitor a first event that the data in an intermediate form stored in the common storage area have been deleted and a second event that the data in a bitmap form stored in the common storage area have been deleted, and to determine presence or absence of area for the data in an intermediate form to be stored when either of the first and second events occurs.