Borrowing other people's works for a second creation and then using it for commercial use, if it does not belong to a reasonable quote, it may constitute copyright. According to the provisions of China's " 1. The content cited when the work of others is cited does not violate the copyright of the copyright owner, but the cited content brings benefits to the copyright owner. 2. The content cited when using another person's work is directly or indirectly used for commercial purposes to bring benefits to the copyright owner. Therefore, if you refer to other people's works for secondary creation and use them for commercial purposes, as long as it brings benefits to the copyright owner, it will constitute a reasonable quote and not constitute an infringement. However, if the content of the second creation exceeds the scope of reasonable quote or if the content of the second creation is directly or indirectly used for commercial purposes, it will be considered as an copyright violation. The specific situation still needed to be judged based on the actual situation. If you have any questions, please consult a relevant professional.