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30results about How to "Strong anti-counterfeiting ability" patented technology
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Multi-dimensional encryption anti-counterfeiting printing technology based on binary signals
InactiveCN102402696ACombating Illegal CopyingStrong anti-counterfeiting abilityVisual presentation using printersRecord carriers used with machinesElectronic documentMulti dimensional
The invention discloses a multi-dimensional encryption anti-counterfeiting printing technology based on binary signals. According to the anti-counterfeiting printing technology, two-dimensional encryption anti-counterfeiting information can be generated into binary modulation signals by encryption and channel coding, and the anti-counterfeiting information is orderly changed in an amplitude modulation screening form and embedded into a whole page in a modulation mode of a circulating table look-up method, so that the anti-counterfeiting information can be identified from a random fragment during presswork identification. The technology has strong fragment resistance, can resist illegal copying behaviors based on a camera, a scanner, an electronic document and the like more effectively, and can be widely applied in the anti-counterfeiting field of presswork.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Encrypting anti-counterfeiting printing technology for modulating shapes of amplitude modulation dots of printed work through binary-system encrypting signal
InactiveCN102184428ACombating Illegal CopyingStrong anti-counterfeiting abilityVisual presentation using printersRecord carriers used with machinesElectronic documentDocumentation
The invention discloses an encrypting anti-counterfeiting printing technology for modulating the shapes of amplitude modulation dots of a printed work through a binary-system encrypting signal. In the anti-counterfeiting printing technology, anti-counterfeiting information is subjected to encryption and channel coding to form a binary-system modulating signal and the anti-counterfeiting information is embedded into a whole page by sequentially changing the shapes of the amplitude modulation dots in a circulating table lookup modulation way. During recognition of the printed work, the anti-counterfeiting information can be recognized from any fragment, so the anti-breakage performance is high, the illegal replication based on a camera, a scanner, an electronic document and the like can be more effectively prevented and the technology can be extensively applied to the field of printed work anti-counterfeiting.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Presswork encryption security printing technology based on multi-system quadrature amplitude modulation
InactiveCN101777134ACombating Illegal CopyingStrong anti-counterfeiting abilityVisual presentationElectronic documentSecurity printing
The invention discloses a presswork encryption security printing technology based on multi-system quadrature amplitude modulation. By adopting the security printing technology, a paseudorandom modulating signal can be generated from anti-counterfeiting information through spread spectrum, encryption and channel coding, the anti-counterfeiting information can be embedded into a whole page through a multi-system quadrature amplitude modulation (QAM) mode, and the anti-counterfeiting information can be identified from any fragment in presswork identification. The invention has very strong smash-resistance, can effectively resist piracy behaviour based on cameras, scanners, electronic documents and the like, and can be widely applied to the field of presswork anti-counterfeit.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Encryption counterfeit printing technology of frequency modulated halftone dot space position for pseudo random signal modulation printed matter
InactiveCN101699845ACombating Illegal CopyingStrong anti-counterfeiting abilityPictoral communicationElectronic documentDocumentation
The invention discloses an encryption counterfeit printing technology based on the frequency modulated halftone dot space position in a pseudo random signal modulation hybrid screening. The counterfeit printing technology can change the counterfeit information into the pseudo random modulation signal through spread spectrum, encryption and channel coding to generate, embed the counterfeit information in the entire page though the quadrature phase shift keying (QPSK), and identify the counterfeit information in any fragment when identifying the printing matter so that the technology of the invention has strong shatter resistant, can more effectively counter the illegal copying behavior based on cameras, scanners, electronic documents and the like, and can be widely applied in the counterfeit field of the printing matter.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Encrypted anti-counterfeit printing technology for modulating shape of printed matter amplitude-modulation screen dot by dual-encrypted signal
InactiveCN102225671ACombating Illegal CopyingStrong anti-counterfeiting abilityPattern printingElectronic documentDigital document
The invention discloses an encrypted anti-counterfeit printing technology for modulating shape of a printed matter amplitude-modulation screen dot by a dual-encrypted signal; the anti-counterfeit printing technology can digitalize anti-counterfeit information to generate an octonary information table with eight bits in one group, and generate an octonary modulation signal by encrypting and channel coding, and embeds the anti-counterfeit information in the orderly change of the shape of the amplitude-modulation screen dot in the whole page by modulating the amplitude-modulation screen dot by a circular look-up table; the anti-counterfeit information can be recognized from any fragment when recognizing the printed matter; the encrypted anti-counterfeit printing technology has strong fragment-resistance so as to effectively resist illegal copying based on a camera, a canner and an electronic document, and can be widely applied to the printed matter anti-counterfeit field.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Insert finger-print-enciphering identifying apparatus and finger-print-enciphering identifying method
InactiveCN1892527AImprove securityStrong anti-counterfeiting abilityDigital data processing detailsCharacter and pattern recognitionFingerprintLiquid-crystal display
The present invention relates to an embedded type fingerprint ciphering identification equipment. It contains embedded type operation system mainboard, control panel, liquid crystal display device, keyboard, fingerprint collecting head assembly and parallel port board. Said method includes making system initialization action, original fingerprint collecting, making fingerprint image preprocess, making featuring location point extracting to preprocessed fingerprint image, storing fingerprint image in data base used as file establishing templet, making user fingerprint collecting, making two fingerprint image featuring location point matching operation, making relevant later processing.
Owner:YINGHUADA (SHANGHAI) ELECTRONIC CO LTD
Device for recognizing state of motor vehicle and ID of driver
InactiveCN1760893AStrong anti-counterfeiting abilityReliable informationCo-operative working arrangementsSensing record carriersDriver/operatorMotor vehicle part
Being installed inside motor vehicle, the disclosed device is composed of controller, memory, input unit, output unit, bus, interfaces (2), (3), (4) as well as IC card for recording information of vehicle and driver. Through bus, memory is connected to the controller. Through interfaces (2), (3), input unit and output unit are connected to bus respectively. Input unit reads out information of vehicle and driver recorded by the IC card, and sends out the information to the controller. Comparing the received information with information stored in memory, the controller recognizes current states of vehicle ID and driver ID. The recognized result and control command are transferred to the output unit, which sends them to information destination of the device. Features are: high capability for anti false, true information, integrated information in real time, good expansibility and convenient transplantation.
Owner:马文伟 +2
Variable anti-counterfeiting computer hologram prepared based on femtosecond laser
ActiveCN112130439AThe principle of imaging change is simpleEasy to operateInstrumentsFemto second laserHolographic imaging
The invention relates to a variable anti-counterfeiting computer hologram prepared based on femtosecond laser, and belongs to the technical field of laser application. According to the invention, a hologram composed of micro-pit structures of three sizes is processed on a heat shrinkable film through femtosecond laser, information recorded by the hologram is formed by combining computer generatedholograms corresponding to two kinds of optical patterns, and the two kinds of optical patterns are shown under irradiation of the laser. By controlling the heating temperature, the heat shrinkable film shrinks, the micro-pit structure with the minimum size shrinks until the transmittance of incident light is hardly influenced, information recorded by the hologram is changed, and finally only oneoptical pattern is presented, so that the change of hologram imaging content is realized. The problems that single holographic imaging is poor in anti-counterfeiting capacity and a variable holographic imaging manufacturing process and an imaging device are complex and difficult to popularize at present are solved. The method is simple in imaging change principle, achieves integration of packagingand anti-counterfeiting, is high in operability, and can be applied to the field of product anti-counterfeiting and information encryption.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Fine particle data protection method based on security model
PendingCN113935049AGuarantee ConsistencyStrong anti-tamperingDigital data protectionTamper resistanceData security
The invention provides a fine particle data protection method based on a security model. The method comprises the following steps: step 1, establishing a data model; step 2, generating a protection rule and binding the protection rule with the data model to generate a security model; step 3, establishing association mapping from the data to the security model; 4, extracting data according to the association mapping relation between the data and the security model to form security model data; and 5, executing the protection rule through the security model to complete data protection. According to the scheme provided by the invention, unified protection measures are provided for common data through the security model, the consistency of data protection strength is guaranteed, and the problem of data leakage caused by a certain protection short board condition is avoided; the security model performs integrity and authenticity protection based on a cryptographic algorithm, and has relatively strong tamper-proof and anti-counterfeiting capabilities; the complexity of data security configuration management is greatly simplified, the professional technical threshold of data security management is reduced, and the efficiency and security of data protection are improved.
Owner:NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
Encrypted Anti-counterfeiting Printing Technology of Pseudo-random Signal Modulation Printed Matter Frequency Modulation Dot Spatial Position
InactiveCN101699845BCombating Illegal CopyingStrong anti-counterfeiting abilityPictoral communicationElectronic documentPhase shifted
The invention discloses an encrypted anti-counterfeiting printing technology based on the pseudo-random signal modulation of the space position of the frequency-modulated dots in the mixed screening. The multi-ary quadrature phase shift modulation (QPSK) method embeds the anti-counterfeiting information in the entire page, which can identify the anti-counterfeiting information from any fragment when identifying printed matter. Scanners, electronic documents and other illegal duplication can be widely used in the field of printed matter anti-counterfeiting.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Mail sending method and device
ActiveCN112688858AStrong anti-counterfeiting abilityIncrease the difficulty of crackingData switching networksTime informationEngineering
The invention discloses a mail sending method and device. The device mainly comprises an attachment processing module, an interception module, a white list confirmation module, an invisible watermark adding module and a mail sending module. The method mainly comprises the following steps: firstly, adding an attachment to an email and acquiring attachment content, searching keywords in the attachment content to judge and confirm whether the email needs to be intercepted or not, and then acquiring the name of an addressee email box to judge a white list; and adding the invisible watermark to the recipient attachment which is not in the white list, and finally sending the new attachment to which the invisible watermark is added to the recipient. The added invisible watermark adopts a font transformation technology, the document content is not obviously different from that of an original document in appearance, no professional tool and algorithm exist, watermark information cannot be modified, and the anti-counterfeiting capacity is high; watermarking information is richer and comprises information of a receiver and a sender and sending time information, and a document transmission path can be accurately positioned.
Owner:HEFEI HIGH DIMENSIONAL DATA TECH CO LTD
Implicit information card
InactiveCN1128067CStrong anti-counterfeiting abilityStable performanceOther printing matterRecord carriers used with machinesHigh wear resistanceInformation Card
Implicit information card has a information layer comprising several information blocks fixed onto a substrate and the information layer and the substrate have obvious difference in reflectivity. A shielding layer covers the substrate part and the information chips in information area completely and there are also magnetic anti-fake uholes embedded inside the substrate. The present invention has the advantages of powerful anti-fake capacity, high wear resistance and stable performance. Furthermore, the substrate may be manufactured into non-directional one for convenient use.
Owner:XINZHONGXIN ELECTRONICS HARBIN
NFC carrier pigeon foot ring anti-counterfeiting identification method
InactiveCN110636069AStrong anti-counterfeiting abilityPrevent counterfeiting of numbers and informationNear-field for read/write/interrrogation/identification systemsAvicultureFilling-inHoming pigeon
The invention provides an NFC carrier pigeon foot ring anti-counterfeiting identification method. The method comprises the following anti-counterfeiting steps: S1, foot ring authentication: after a user downloads an APP of a homing pigeon foot ring manufacturer, enabling a foot ring to be close to an NFC equipment scanning area, starting NFC equipment scanning, sending an authentication request byNFC equipment, carrying out verification, confirming that the homing pigeon foot ring is a legal foot ring, and ending the authentication; and S2, carrier pigeon file establishment: after the carrierpigeon file is authenticated as a legal foot ring, filling in the carrier pigeon feather color, eye sand, blood lineage, nickname, pigeon age and other basic information under the serial number of the legal foot ring, uploading a carrier pigeon photo, submitting a basic information application, and successfully establishing the carrier pigeon file if the application succeeds. The homing pigeon foot ring verification method is high in anti-counterfeiting capability, prevents others from counterfeiting numbers and information by recording the basic information data of the homing pigeons, and isgreatly helpful for fairness and fairness of homing pigeon competitions.
Owner:瀚辰科技有限公司
Binary anti-fake printing method by two-dimensional encryption
InactiveCN102945477APrevent overflowStrong anti-counterfeiting abilityRecord carriers used with machinesPictoral communicationScreentoneAlgorithm
The invention relates to a binary anti-fake printing method by two-dimensional encryption. According to the method, binary anti-fake information can be converted into a binary modulation signal by Ni@kC encryption operation and channel encoding, and the anti-fake information is embedded in the full page in a circulating look-up table modulation manner in orderly change of shapes of amplitude modulation websites, so that the anti-fake information can be identified from any one fragment when a printed matter is identified. The method can be widely applied to the field of forgery prevention of printed matters.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Binary anti-counterfeiting printing method based on three-dimensional encrypted anti-counterfeiting information
InactiveCN102945461BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationSecurity informationComputer science
The invention relates to a binary anti-counterfeit printing method based on three-dimensional encrypting anti-counterfeit information, which comprises the steps of generating a binary modulation signal through Ni@1kC@2kC#3kC encrypting calculation and channel coding of binary anti-counterfeit information; and embedding order change of anti-counterfeit information in shape of amplitude modulation websites in a circular look-up table manner. The anti-counterfeit information can be identified from any one fragment when printing materials are identified, so that the binary anti-counterfeit printing method based on the three-dimensional encrypting anti-counterfeit information can be widely applied to the anti-counterfeit field of printing materials.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Multi-parameter binary encryption anti-counterfeiting printing method
InactiveCN102945425BCombating Illegal CopyingStrong anti-counterfeiting abilityRecord carriers used with machinesPictoral communicationComputer scienceChannel encoding
The invention relates to a multi-parameter binary anti-counterfeiting printing method which comprises the following steps: generating binary anti-counterfeiting information into a binary modulation signal through Ni@1C1@2C2@3C3@4C4 encryption algorithm and channel coding and embedding the anti-counterfeiting information into a whole page through the orderly change of the shape of an amplitude modulation dot in a circular table look-up method modulation manner. When printed matters are identified, the anti-counterfeiting information can be identified from any one fragment; and the multi-parameter binary anti-counterfeiting printing method can be widely applied to the field of anti-counterfeiting of printed matters.
Owner:GUANGDONG UNIV OF PETROCHEMICAL TECH
Lock switch method of intelligent electronic lock system with UHF radio frequency identification function
ActiveCN104563654BTake advantage ofNo additional costNon-mechanical controlsElectric permutation locksMicrocontrollerOperational costs
The invention discloses an intelligent electronic lock system with an ultrahigh frequency radio frequency identification function as well as unlocking and locking methods of the intelligent electronic lock system, wherein the intelligent electronic lock system comprises an intelligent electronic lock and a background system, wherein the intelligent electronic lock comprises a mechanical lock, a micro motor, a microcontroller, an electronic tag and a battery, the background system comprises a reader-writer and a background computer, the background computer reads a memory area of the electronic tag through the reader-writer, the state of the mechanical lock is determined, and in addition, a control command is written into the memory area of the electronic tag; the microcontroller obtains the control command from the memory area of the electronic tag, the on-off state of the electronic lock is detected, the micro motor is driven to take locking and unlocking actions according to the control command, and in addition, the state information of the electronic lock is written into the memory area of the electronic tag. The system solves the problems that the disposable electronic lead seal cannot be repeatedly used in logistics industry in the prior art, and the operation cost is higher.
Owner:BEIJING INST OF COMP TECH & APPL
Presswork encryption security printing technology based on multi-system quadrature amplitude modulation
InactiveCN101777134BCombating Illegal CopyingStrong anti-counterfeiting abilityVisual presentationElectronic documentSecurity printing
The invention discloses a presswork encryption security printing technology based on multi-system quadrature amplitude modulation. By adopting the security printing technology, a paseudorandom modulating signal can be generated from anti-counterfeiting information through spread spectrum, encryption and channel coding, the anti-counterfeiting information can be embedded into a whole page through a multi-system quadrature amplitude modulation (QAM) mode, and the anti-counterfeiting information can be identified from any fragment in presswork identification. The invention has very strong smash-resistance, can effectively resist piracy behaviour based on cameras, scanners, electronic documents and the like, and can be widely applied to the field of presswork anti-counterfeit.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Encrypting anti-counterfeiting printing technology for modulating shapes of amplitude modulation dots of printed work through binary-system encrypting signal
InactiveCN102184428BCombating Illegal CopyingStrong anti-counterfeiting abilityVisual presentation using printersRecord carriers used with machinesElectronic documentScanner
The invention discloses an encrypting anti-counterfeiting printing technology for modulating the shapes of amplitude modulation dots of a printed work through a binary-system encrypting signal. In the anti-counterfeiting printing technology, anti-counterfeiting information is subjected to encryption and channel coding to form a binary-system modulating signal and the anti-counterfeiting information is embedded into a whole page by sequentially changing the shapes of the amplitude modulation dots in a circulating table lookup modulation way. During recognition of the printed work, the anti-counterfeiting information can be recognized from any fragment, so the anti-breakage performance is high, the illegal replication based on a camera, a scanner, an electronic document and the like can be more effectively prevented and the technology can be extensively applied to the field of printed work anti-counterfeiting.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Method and device for sending mail
ActiveCN112688858BStrong anti-counterfeiting abilityIncrease the difficulty of crackingSecuring communicationTime informationInternet privacy
Owner:HEFEI HIGH DIMENSIONAL DATA TECH CO LTD
Binary anti-fake printing method by two-dimensional encryption
InactiveCN102945477BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationBinary modulationEncryption
The invention relates to a binary anti-fake printing method by two-dimensional encryption. According to the method, binary anti-fake information can be converted into a binary modulation signal by Ni@kC encryption operation and channel encoding, and the anti-fake information is embedded in the full page in a circulating look-up table modulation manner in orderly change of shapes of amplitude modulation websites, so that the anti-fake information can be identified from any one fragment when a printed matter is identified. The method can be widely applied to the field of forgery prevention of printed matters.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Anti-fake printing method by two-dimensional encryption
InactiveCN102945424ACombating Illegal CopyingStrong anti-counterfeiting abilityRecord carriers used with machinesPictoral communicationComputer scienceChannel encoding
The invention relates to an anti-fake printing method by two-dimensional encryption. According to the method, anti-fake information can be converted into a binary modulation signal by Ni&C encryption operation and channel encoding, and the anti-fake information is embedded in the full page in a circulating look-up table modulation manner in orderly change of shapes of amplitude modulation websites, so that the anti-fake information can be identified from any one fragment when a printed matter is identified. The method can be widely applied to the field of forgery prevention of printed matters.
Owner:CHANGZHOU INST OF LIGHT IND TECH
A kind of preparation method of deer blood wine/deer antler blood wine
ActiveCN107815379BEvenly distributedNo precipitationAlcoholic beverage preparationBiotechnologyBotany
Owner:黑龙江鹿源春鹿业股份有限公司
Binary anti-fake printing method by two-dimensional dynamic variable-parameter encryption
InactiveCN102945433BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationComputer scienceChannel encoding
The invention relates to a binary anti-fake printing method by two-dimensional dynamic variable-parameter encryption. According to the method, binary anti-fake information can be converted into a binary modulation signal by Ni@k(C+(j+h)) encryption operation and channel encoding, and the anti-fake information is embedded in the full page in a circulating look-up table modulation manner in orderly change of shapes of amplitude modulation websites, so that the anti-fake information can be identified from any one fragment when a printed matter is identified. The method can be widely applied to the field of forgery prevention of printed matters.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Binary anti-fake printing method by two-dimensional dynamic variable-parameter encryption
InactiveCN102945433APrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationScreentoneAlgorithm
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Binary Anti-counterfeiting Printing Method with Single Parameter Incremental Variation Encryption
InactiveCN102945458BPrevent overflowStrong anti-counterfeiting abilityRecord carriers used with machinesPictoral communicationSingle sequenceComputer science
The invention provides a single-parameter, increasing and variable-sequence encryption type binary anti-counterfeit printing method; in the method, through encryption operation and channel coding, binary anti-counterfeit information can be generated into a binary modulating signal; and the orderly change of the anti-counterfeit information in the form of an amplitude modulation dot is embedded into the whole page through a circulating table lookup method; the anti-counterfeit information can be identified from any fragment during identifying a printing material; and the single-parameter, increasing and variable-sequence encryption type binary anti-counterfeit printing method provided by the invention can be widely applied to the anti-counterfeit field of printing materials.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Two-variable one-dimensional progressive encrypted binary anti-counterfeiting printing method
InactiveCN102945452BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationBinary modulationEncryption
The invention discloses a double-variant one-dimensional progressive encryption binary anti-counterfeiting printing method which comprises the following steps: performing [+++] encrypting operation and channel encoding to binary anti-counterfeiting information to generate a binary modulating signal, and adopting a modulation mode of a looped look-up table method to embed the anti-counterfeiting information into the whole page through sequential change in a shape of amplitude-modulated dot. Therefore, the anti-counterfeiting information can be recognized from any fragment during presswork recognition. The method can be widely applied to the anti-counterfeiting field of presswork.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Multi-parameter first-order encryption binary anti-counterfeiting printing method
InactiveCN102945445BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationComputer scienceMulti parameter
The invention relates to a binary anti-fake printing method by multiparameter single-order encryption. According to the method, binary anti-fake information can be converted into a binary modulation signal by [++] encryption operation and channel encoding, and the anti-fake information is embedded in the full page in a circulating look-up table modulation manner in orderly change of shapes of amplitude modulation websites, so that the anti-fake information can be identified from any one fragment when a printed matter is identified. The method can be widely applied to the field of forgery prevention of printed matters.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
Double-encryption binary anti-counterfeiting printing method
ActiveCN102945468BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationAlgorithmChannel encoding
The invention discloses a double-encryption binary anti-counterfeiting printing method which comprises the following steps: performing Ni@1kC@2kC encrypting operation and channel encoding to binary anti-counterfeiting information to generate a binary modulating signal, and adopting a modulation mode of a looped look-up table method to embed the anti-counterfeiting information into the whole page through sequential change in a shape of amplitude-modulated dot. Therefore, the anti-counterfeiting information can be recognized from any fragment during presswork recognition. The method can be widely applied to the anti-counterfeiting field of presswork.
Owner:北京奇良海德印刷股份有限公司
Single-parameter first-order cyclic encryption binary anti-counterfeiting printing method
InactiveCN102945447BPrevent overflowCombating Illegal CopyingRecord carriers used with machinesPictoral communicationComputer scienceChannel encoding
The invention relates to a single-parameter first-order encrypted binary anti-counterfeiting printing method which comprises the following steps: generating binary anti-counterfeiting information into a binary modulation signal through encryption algorithm and channel coding and embedding the anti-counterfeiting information into a whole page through the orderly change of the shape of an amplitude modulation dot in a circular table look-up method modulation manner. When printed matters are identified, the anti-counterfeiting information can be identified from any one fragment; and the single-parameter first-order encrypted binary anti-counterfeiting printing method can be widely applied to the field of anti-counterfeiting of printed matters.
Owner:BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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