Sales of used software are not popular by the software companies, normally they want to sell the software "as new".
The real problem is the license which is locked to a specific server.
The license is not impossible to crack but be aware that Siemens is tracing illegal copies and will knock on the door when they find one.
License transfer from server to server within the company can be done ( by Siemens) , it has a administrative cost, but not company to company.