First, find all 5 patents. Look at the application date and expiration date. Analyze the weight of 5 patents. There must be main patents and peripheral patents. If you don't need the patent here, you can negotiate with the other party. If the other party insists on bundling and selling five patents together, this would involve monopoly and commercial violations. Regional analysis. If a patent protects 4 countries. Your target market only has the protection scope of 2 of them. You can use this as an excuse to lower the price. In terms of time, the protection period of an invention is 20 years. If there are only a few years of protection left, the price can be severely reduced. Regarding exclusivity, depending on the licensing method of the other party's patent, the price of exclusive licensing must be very high, but if it has already licensed it to other companies. This way you can ask for the same price as the other party. If the price difference is particularly large, there is a possibility that the other party's behavior can be sued as a commercial monopoly, and the other party has the obligation to fairly license the patent to any company.