Question for Adobe SDK, Scripting service.

I am a software developer in Korea.

In order to develop a program using the Adobe SDK, after reading the documents provided by Adobe Website, I have a question.

1. If I develop Adobe Support Program using Adobe SDK and use it commercially, will I have to pay for it?

2. Can the Adobe SDK apply to all Adobe programs?

 

3. Is Adobe SDK a development tool to help you access the script service provided by Adobe from an external program?

 

3-1. If the Script service in the above question is available in an external program, is there any restriction on the external program develop language (e.g., can only be developed with C++, or whether C# and Electron are supported?)

 

4. Is there any cost or legal problem when developing a program that can control Adobe Program by communicating with Script service without using Adobe SDK?

 

4-1. If there are no costs or legal issues with the above questions, can I get some advice on how to control scripts using the Program Protocol and communications?

 

I would be very grateful if you could solve the above questions.