1. If the model used is public, and the author has explicitly authorized its use, or the user has obtained the model through legal means (such as purchasing or having a license), then the model can be used. However, it should follow the author's requirements and reference specifications when using it.

2. If the model used involves intellectual property rights and other relevant laws and regulations, the user shall abide by the relevant provisions and obtain the corresponding authorization; At the same time, we should follow the moral standards, and the borrowed model needs proper quotation and thanks.