Answer:
NO
Step-by-step explanation:
No, there is no way to know if the model you downloaded was made using a pirated copy of Solidworks or Autodesk. It is possible to download free models from legitimate sources such as 3D Warehouse, but it is also possible to download models from sites that are known to host pirated models. The only way to be sure that you are downloading a legitimate model is to purchase it from an authorized source.