bogyeong2 I'm not sure if I understood your question correctly, but if you want to reference or use a video that was not published by us, please contact the original poster directly.
We occasionally receive inquiries such as: “Is it okay to create tutorial videos about Spine techniques?” or “Is it acceptable to show the Spine Editor UI as is?” You are free to create such content, whether paid or free, and you are not required to mention Esoteric Software or include us in the credits.
However, please do not use our logo in a way that might give the impression that the tutorial was officially created by us.
You may contact us either through the forum or by email—both methods are fine. If you have any other questions, please feel free to ask.