Communication management system, communication system, communication management device, image processing method, and non-transitory computer-readable medium

A communication system, comprising:

• a plurality of terminal apparatuses including a first terminal apparatus and a second terminal apparatus;
• and
• a communication management system that shares a stroke image between the first terminal apparatus and the second terminal apparatus, wherein
• the first terminal apparatus includes first circuitry configured to designate at least one piece of stroke data of a plurality of pieces of stroke data representing the stroke image,
• the second terminal apparatus includes second circuitry configured to receive a notification, regarding an operation on one or more pieces of stroke data of the plurality of pieces of stroke data, from the communication management apparatus, and
• the communication management apparatus includes third circuitry configured to
• perform determination as to whether the at least one piece of stroke data is restricted from being operated;
• and
• restrict, based on a result of the determination, the operation by the second terminal apparatus on the one or more pieces of stroke data while the first terminal apparatus performs another operation on the one or more pieces of stroke data.

A communication method, comprising:

• sharing a stroke image between a first terminal apparatus and a second terminal apparatus;
• providing, to the second terminal apparatus, a notification regarding an operation on one or more pieces of stroke data of a plurality of pieces of stroke data which represent the stroke image;
• performing determination as to whether at least one piece of stroke data, having been designated by the first terminal apparatus from the plurality of pieces of stroke data, is restricted from being operated;
• and
• restricting, based on a result of the determination, the operation by the second terminal apparatus on the one or more pieces of stroke data while the first terminal apparatus performs another operation on the one or more pieces of stroke data.