Australian Autun Limited Shanghai Representative Office wrote to our company that we used unauthorized software. What should we do?

Well, intellectual property rights should still be respected. Let me give you an example. You buy the so-called "genuine", and you use the name Xiyue when you register. The person who sent a lawyer's letter threatening their company has always said that they have monitored that someone in your company registered their pirated software under your company's IP. So whoever needs to register, use this name and let her sue herself. Second, ignoring any of their information is basically all kinds of threats and intimidation on the grounds of lawyer's letter, prosecution and evidence. Don't ignore it directly, and don't adjust it. After all, yours is "genuine". As long as you are reasonable and willing to mediate, you will catch up and bite like a mad dog. Anything you say to them, as long as you produce evidence that you have used pirated software, they will keep it for prosecution (before that, their so-called evidence was useless). Third, the software is used offline. After all, how can you trust the software of an imperialist company with such an important thing as drawings? The back door is terrible. Then the other party may report to the industry and commerce, as well as lawyers, industry and commerce, notaries and so on. Will check the computer. Well, how can the R&D department try to hide a core secret like a drawing computer? By the way, don't simply format or reinstall the system. After all, there is such a thing as a computer machine number. The above is not to support you to use pirated products, but to cause unnecessary misunderstanding when using genuine products. After all, it is not good for a mad dog to come out and bite.