Content sharing device, method, program, and system for sharing content derived from digital ink

A content sharing method performed by one or a plurality of computers, comprising:

• acquiring main content and sub-content, at least one of which is derived from digital ink;
• in response to receipt of a request made by a terminal device operated by a user, selecting either first provision data or second provision data depending on usage rights of the user and transmitting the first or second provision data that has been selected to the terminal device, the first provision data including only the main content that has been acquired, the second provision data including both the main content and the sub-content that have been acquired, and
• sequentially storing, in association with a point in time of editing, each content element generated at or after a point in time of start of creation of the main content,
• wherein the sub-content includes content generated using a plurality of content elements that are generated before the main content is published or content generated using a plurality of content elements that are generated after the main content is published,
• wherein the sub-content is acquired by generating a still image or a moving image that depicts a process of creating the main content using one or a plurality of content elements whose point in time of editing is earlier than a point in time of the publication of the main content among a group of content elements which are stored, and
• wherein, when the main content is the digital ink, the first or second provision data is transmitted that includes the main content not having been rasterized and on which authenticity-related countermeasure processing has been performed.

A non-transitory computer readable medium storing a program configured to cause one or a plurality of computers to perform:

• acquiring main content and sub-content, at least one of which is derived from digital ink;
• in response to receipt of a request made by a terminal device operated by a user, selecting either first provision data or second provision data depending on usage rights of the user and transmitting the first or second provision data that has been selected to the terminal device, the first provision data including only the main content that has been acquired, the second provision data including both the main content and the sub-content that have been acquired, and
• sequentially storing, in association with a point in time of editing, each content element generated at or after a point in time of start of creation of the main content,
• wherein the sub-content includes content generated using a plurality of content elements that are generated before the main content is published or content generated using a plurality of content elements that are generated after the main content is published,
• wherein the sub-content is acquired by generating derivative content derived from the main content using one or a plurality of content elements whose point in time of editing is later than a point in time of the publication of the main content among a group of content elements which are stored, and
• wherein, when the main content is the digital ink, the first or second provision data is transmitted that includes the main content not having been rasterized and on which authenticity-related countermeasure processing has been performed.

A content sharing system comprising:

• a content sharing device including:
• a content acquisition circuit configured to acquire main content and sub-content, at least one of which is derived from digital ink,
• a transmission processing circuit configured to, in response to receipt of a request made by a terminal device operated by a user, select either first provision data or second provision data depending on usage rights of the user and transmit the first or second provision data that has been selected to the terminal device, the first provision data including only the main content that has been acquired by the content acquisition circuit, the second provision data including both the main content and the sub-content that have been acquired by the content acquisition circuit, and
• a storage configured to sequentially store, in association with a point in time of editing, each content element generated at or after a point in time of start of creation of the main content,
• in which the sub-content includes content generated using a plurality of content elements that are generated before the main content is published or content generated using a plurality of content elements that are generated after the main content is published,
• wherein the content acquisition circuit acquires the sub-content by generating a derivative content derived from the main content using one or a plurality of content elements whose point in time of editing is later than a point in time of the publication of the main content among a group of content elements stored in the storage, and
• wherein, when the main content is the digital ink, the transmission processing circuit transmits the first or second provision data that includes the main content not having been rasterized and on which authenticity-related countermeasure processing has been performed;
• and
• at least one terminal device, including said terminal device, configured to communicate bidirectionally with the content sharing device.