Abstract: A display terminal includes circuitry that: displays a predetermined-area moving image; receives designation of a first object visible in a first predetermined-area moving image being a predetermined-area moving image in a first display area and representing a first predetermined area of the wide-view moving image; receives designation of a second object visible in a second predetermined-area moving image being a predetermined-area moving image in a second display area and representing a second predetermined area of the wide-view moving image; displays the first predetermined-area moving image such that movement of the first object is tracked to make the first object continuously visible in the first predetermined-area moving image within the first display area; and displays the second predetermined-area moving image such that movement of the second object is tracked to make the second object continuously visible in the second predetermined-area moving image within the second display area.

Abstract: A display terminal includes circuitry that: displays, on a display, a predetermined-area moving image, the predetermined-area moving image representing a predetermined area of a wide-view moving image having a wide angle of view; receives designation of a specific object visible in the predetermined-area moving image displayed on the display; and displays, on the display, the predetermined-area moving image such that movement of the specific object that is designated is tracked to make the specific object continuously visible in the predetermined-area moving image.

Abstract: A communication management apparatus includes a memory and circuitry. The memory stores a hierarchical data structure in which each page of a plurality of pages forming a display screen shared by a plurality of communication terminals is associated with one or more objects included in the each page. The circuitry receives, from one communication terminal of the plurality of communication terminals, an operation request that requests an operation on a particular object of the one or more objects. When editing of the particular object and editing of data in a lower layer associated with a higher layer of the particular object are both allowed, the circuitry transmits a success notification to the one communication terminal to notify success of the operation on the particular object.

Abstract: A communication terminal, a system, a method, and a control program stored in a non-transitory recording medium for controlling capturing of an image, each of which displays, on a display of the communication terminal, an image based on image data to be shared with a counterpart communication terminal; receives an instruction to prohibit capturing of a screen that includes the image based on the image data; and transmits, from the communication terminal to the counterpart communication terminal, information related to the instruction to prohibit capturing of the screen.

Abstract: A communication management system manages a session in which a plurality of terminal apparatuses shares a stroke image. The communication management system includes circuitry configured to: manage stroke information including a plurality of pieces of stroke data representing the stroke image; receive, from a first terminal apparatus, group operation information for designating one or more pieces of stroke data, which are operation targets, from among the plurality of pieces of stroke data; and restrict, based on the group operation information, an operation regarding the one or more pieces of stroke data by a second terminal apparatus, which is different from the first terminal apparatus.

Abstract: A communication management system manages a session in which a plurality of terminal apparatuses shares a stroke image. The communication management system includes circuitry configured to: manage stroke information including a plurality of pieces of stroke data representing the stroke image; receive, from a first terminal apparatus, group operation information for designating one or more pieces of stroke data, which are operation targets, from among the plurality of pieces of stroke data; and restrict, based on the group operation information, an operation regarding the one or more pieces of stroke data by a second terminal apparatus, which is different from the first terminal apparatus.

Abstract: A management system includes circuitry to receive an operation request for a specific device of one or more devices from a communication terminal used by a user for who user authentication has been successfully performed by a management system. The one or more devices and the communication terminal are communicating with each other to execute an event managed by the management system. The circuitry stores, in a memory, operation identification information and access information in association with each other. The operation identification information identifies a device operation associated with the operation request. The access information is associated with the user and used to access external storage. The circuitry uploads data acquired by the specific device according to the device operation corresponding to the operation identification information to the external storage using the access information associated with the operation identification information.

Abstract: A communication terminal includes circuitry to: transmit a participation request for requesting participation in a remote conference being conducted between one or more other communication terminals, to a communication management apparatus that manages data being shared between the other communication terminals; receive screen data of a display screen being currently displayed at the other communication terminals from the communication management apparatus, the screen data of the display screen being one of a plurality of items of screen data generated at at least one of the other communication terminals in the remote conference; and control a display to display the display screen based on the screen data that is received.

Abstract: A communication terminal shares data with another communication terminal. The communication terminal includes circuitry. The circuitry receives, from a communication management apparatus that manages the data shared with the another communication terminal, storage location information representing a storage location of background image data transmitted from the another communication terminal, and transmits a download request to an image storing apparatus corresponding to the storage location to request download of the background image data. The circuitry further starts downloading the background image data from the image storing apparatus and receives, from the communication management apparatus, stroke data of a stroke image rendered on the another communication terminal.

Abstract: A communication terminal comprising circuitry to: receive selection of screen data, from among one or more items of screen data, as sharing target data to be shared with other communication terminal, each screen data to be used for generating a display screen and having been generated at the communication terminal; and share the sharing target data with the other communication terminal.

Abstract: A communication system includes a first communication terminal and a second communication terminal that shares a plurality of images with the first communication terminal. The first communication terminal includes first circuitry that receives a change of a display order of the plurality of images displayed on a display of the first communication terminal; and transmit information regarding the changed display order of the plurality of images to the second communication terminal. The second communication terminal includes second circuitry to change the display order of the plurality of images displayed on a display of the second communication terminal in accordance with the information regarding the display order of the plurality of images received from the first communication terminal. A method for communicating, performed by a communication terminal, the communication terminal, and a non-transitory recording medium executing the method for communicating are provided.

Abstract: A communication terminal, a system, a method, and a control program stored in a non-transitory recording medium for controlling capturing of an image, each of which displays, on a display of the communication terminal, an image based on image data to be shared with a counterpart communication terminal; receives an instruction to prohibit capturing of a screen that includes the image based on the image data; and transmits, from the communication terminal to the counterpart communication terminal, information related to the instruction to prohibit capturing of the screen.

Abstract: A communication management system, a communication system, a communication control method, and a recording medium.

Abstract: A communication management apparatus includes a memory and circuitry. The memory stores a hierarchical data structure in which each page of a plurality of pages forming a display screen shared by a plurality of communication terminals is associated with one or more objects included in the each page. The circuitry receives, from one communication terminal of the plurality of communication terminals, an operation request that requests an operation on a particular object of the one or more objects. When editing of the particular object and editing of data in a lower layer associated with a higher layer of the particular object are both allowed, the circuitry transmits a success notification to the one communication terminal to notify success of the operation on the particular object.

Abstract: A communication terminal shares data with another communication terminal. The communication terminal includes circuitry. The circuitry receives, from a communication management apparatus that manages the data shared with the another communication terminal, storage location information representing a storage location of background image data transmitted from the another communication terminal, and transmits a download request to an image storing apparatus corresponding to the storage location to request download of the background image data. The circuitry further starts downloading the background image data from the image storing apparatus and receives, from the communication management apparatus, stroke data of a stroke image rendered on the another communication terminal.

Abstract: A screen sharing system is configured to perform screen sharing between a first information processing apparatus and a second information processing apparatus. The first information processing apparatus is configured to acquire, as screen-sharing information, an image displayed on the first information processing apparatus, and transmit the screen-sharing information to a first server, when a data amount of the screen-sharing information is below a threshold value, and transmit the screen-sharing information to a second server and transmit, to the first server, storage destination information indicating a storage destination of the screen-sharing information, when the data is greater than or equal to the threshold value.

Abstract: A distribution system includes circuitry to: encrypt a part of each of a plurality of images constituting a video image, the part having an angle of view other than a normal angle of view; provide a decryption key to a receiving client terminal operated by an authorized viewer; decrypt the part of each of the plurality of images having the angle of view other than the normal angle of view by using the decryption key provided; and display the video image based on other part of each of the plurality of images that is not encrypted having the normal angle of view and the decrypted part of each of the plurality of images having the angle of view other than the normal angle of view.

Abstract: A communication terminal includes an interface and circuitry. The interface communicates with a counterpart communication terminal to share data with the counterpart communication terminal that is input with first image data. The circuitry causes a display to display an image associated with second image data. The second image data is compressed data of the first image data. The circuitry further transmits, to a server, a capture image acquisition request that is a request for a capture image corresponding to the image associated with the second image data and displayed on the display. The server manages shared data to be shared with the counterpart communication terminal. The circuitry further receives, from the server, capture image data of an image associated with the first image data. The capture image data is acquired by the counterpart communication terminal in response to the capture image acquisition request.

Abstract: A communication terminal comprising circuitry to: receive selection of screen data, from among one or more items of screen data, as sharing target data to be shared with other communication terminal, each screen data to be used for generating a display screen and having been generated at the communication terminal; and share the sharing target data with the other communication terminal.

Abstract: A communication management system, a communication system, a communication control method, and a recording medium.