In order to promote scientific and technological progress and reduce duplication of research, the state has established a patent system to protect qualified inventions. Without the permission of the patentee, others may not produce, sell, use or promise to sell patented products (or products obtained by patented methods).
The price paid by the patentee is the monopoly right in a certain time and region.
The benefits to the public are that they can learn about existing inventions, avoid repeated development, reduce waste, and further research and development on the basis of existing technologies; The price paid is to pay for the patent monopoly interests.
Anyone can consult the patent documents, but if you do it within the validity period of the patent, the patentee has the right to claim compensation.