When you install ReqView then it is activated with teh FREE plan, which offers limited set of features free of charge. For instance, you are not allowed to edit projects with more than 1 document or a document with more than 150 objects or more than 1 custom attribute. For full comparison of ReqView plans check the Pricing page.

Even with the FREE plan, you can check most of the advanced features if you open the ReqView Demo project.