# US 12,113,804 B2 · Method for authorized use of projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,804 B2 - Document ID: US12113804B2 - Status: Granted - Kind: B2 - Application number: 17/310,888 - Filed: 2020-02-26 - Published: 2022-05-12 - Granted: 2024-10-08 - Earliest claimed: 2019-02-27 - Assignees: Appotronics Corporation Limited - Applicants: Appotronics Corporation Limited - Inventors: Biqiong Zhang - Web page: https://patentgrep.com/patent/US12113804B2 ## CPC - H04L 63/123: {received data contents, e.g. message integrity} - G06F 21/33: using certificates - G06F 21/44: Program or device authentication - G06F 21/60: Protecting data - G06K 7/1417: {2D bar codes} - G06K 19/06037: {multi-dimensional coding} - G06Q 30/06: Buying, selling or leasing transactions - H04L 63/0442: {wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption (cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30)} - H04L 63/045: {wherein the sending and receiving network entities apply hybrid encryption, i.e. combination of symmetric and asymmetric encryption (cryptographic mechanisms or cryptographic arrangements using a plurality of keys or algorithms H04L9/14)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR ## Abstract A method for authorized use of a projector, comprising the following steps: a projector encodes a license into a QR code and displays same by means of projection; a mobile terminal identifies the QR code to obtain the license and transmits the license and a local terminal identifier of the mobile terminal to a projector authorization server; the projector authorization service verifies the local terminal identifier and the license and generates verification information if the verification is successful, and transmits the verification information to the mobile terminal; the mobile terminal receives and displays the verification information; the projector receives the input verification information, locally verifies the verification information, and if the local verification is successful, obtains use authorization corresponding to authorization information. ## Claims ### Claim 1 A method for authorized use of a projector, the method comprising: obtaining a license comprising authorization information stored on the projector; encoding the license into a quick response (QR) code and displaying the QR code by means of projection, wherein the QR code is scanned and identified by a mobile terminal, the mobile terminal is configured to identify the QR code to obtain the license, transmit the license and a local terminal identifier of the mobile terminal to a projector authorization server, and receive verification information generated by the projector authorization server in response to verification by the projector authorization server on the license and the local terminal identifier being successful; and receiving the verification information, performing local verification on the verification information, and obtaining use authorization corresponding to the authorization information in response to the local verification being successful. ### Claim 2 (depends on 1) The method according to claim 1, wherein the authorization information comprises at least one of authorized use duration, a lease use time period, or geographic location information. ### Claim 3 (depends on 1) The method according to claim 1, wherein prior to said encoding, by the projector, the license into the QR code and displaying the QR code by means of projection, the projector is preset with an asymmetric encryption public key, and the projector asymmetrically encrypt the license through the asymmetric encryption public key to generate the QR code. ### Claim 4 (depends on 3) The method according to claim 3, wherein the projector authorization server is preset with an asymmetric encryption private key matching the asymmetric encryption public key, and the projector authorization server is configured to decrypt the asymmetrically encrypted license through the asymmetric encryption private key. ### Claim 5 (depends on 1) The method according to claim 1, wherein the license further comprises a projector identifier and a symmetric encryption key that is randomly generated, wherein the projector authorization server is further configured to extract the projector identifier and the symmetric encryption key from the license, and transmit the verification information and the projector identifier that have been encrypted by using the symmetric encryption key. ### Claim 6 (depends on 5) The method according to claim 5, comprising, prior to said performing local verification on the verification information: decrypting the verification information and the projector identifier by using the symmetric encryption key. ### Claim 7 (depends on 6) The method according to claim 6, wherein said performing local verification on the verification information comprises: obtaining a local projector identifier, comparing the decrypted verification information with verification information stored in the projector in response to the decrypted projector identifier being consistent with the local projector identifier, and determining that the local verification is successful in response to the decrypted verification information being consistent with the verification information stored in the projector. ### Claim 8 (depends on 1) The method according to claim 1, wherein said receiving the verification information that is inputted comprises: receiving the verification information that is inputted by a remote control. ### Claim 9 A method for authorized use of a projector, the method comprising: scanning a quick response (QR) code that is displayed by the projector by means of projection, decoding the QR code to obtain a corresponding license, and extracting an address of a projector authorization server from the license; obtaining a local terminal identifier, and transmitting the local terminal identifier and the license to the projector authorization server corresponding to the address of the projector authorization server, wherein the projector authorization server performs verification on the license, and the license comprises authorization information and the address of the projector authorization server; and receiving verification information that is generated by the projector authorization server in response to verification by the projector authorization server on the local terminal identifier and the license being successful, wherein the verification information is inputted to the projector, and the projector performs local verification on the verification information and obtains use authorization corresponding to the authorization information in response to the local verification being successful. ### Claim 10 (depends on 9) The method according to claim 9, wherein the authorization information comprises at least one of authorized use duration, a lease use time period, or geographic location information. ### Claim 11 (depends on 10) The method according to claim 10, wherein the projector authorization server performs verification on the license by determining whether the authorization information in a current license received by the projector authorization server is within an authorization range. ### Claim 12 (depends on 9) The method according to claim 9, wherein the QR code is generated by the projector which asymmetrically encrypts the license by using an asymmetric encryption public key. ### Claim 13 (depends on 12) The method according to claim 12, wherein the projector authorization server is further configured to decrypt the license by using an asymmetric encryption private key corresponding to the asymmetric encryption public key. ### Claim 14 (depends on 13) The method according to claim 13, wherein the license further comprises a projector identifier and a symmetric encryption key that is randomly generated, wherein the projector authorization server is further configured to extract the projector identifier and the symmetric encryption key from the license, and transmit the verification information and the projector identifier that are encrypted by using the symmetric encryption key. ### Claim 15 (depends on 9) The method according to claim 9, wherein the verification information is inputted to the projector by a remote control. ### Claim 16 (depends on 9) The method according to claim 9, wherein the mobile terminal is a smart phone, and the local terminal identifier is a mobile phone number.