With the development of science and technology, the copying technology is also moving forward. Today's copying technology, even if there are more than 2 layers of PCP boards, professional copying teams can draw detailed principles if they are not designed to prevent copying. Taking precautions can appropriately increase the difficulty of copying, so that the input of copying team is not proportional to the value, and it is not worth giving up.
preventing copying is not only a technical problem, but also a game with copying personnel. It is impossible to pursue the technology of copying without cost in product design. The more precautions, the more difficult the design, and the higher the cost of the product. The degree of prevention depends on the input and value of the product.
what are the general measures to prevent copying?
1. Sealing and painting the printed circuit board, which can simply and appropriately increase the difficulty of copying the board.
2. The key to chip polishing and copying is to know the chip. If you are familiar with all the chips on the printed board, copying the board will be much easier. Under the premise of not affecting the function of the chip, all the models of the chip are polished. Unable to find the model of the chip, it is very difficult for the copywriter.
3. Use some relatively unpopular and uncommon chips appropriately. If it is a very common chip, even if the chip model cannot be viewed, it is easy to infer the chip model according to the packaging and use experience.
4. Buried holes and blind holes are used in PCB design, and the over-control is hidden in the board. It is difficult for board copying personnel to infer the actual wiring according to the multi-layer lines, but the research and development costs of buried holes and blind holes are high, and they are generally only used in high-end products.
5. The processor selects chips with good encryption performance, difficult decryption and high security performance.
6. Add self-destruction function chips in hardware design and anti-piracy function programs in software.
The circuit boards made in the 199s are easy to copy, so the diodes that were broken down during maintenance and a pack of capacitors that were all broken down by the factory bought at Sichuan Electronic Temple Fair were used. The diodes were used as wires, and the capacitors were connected in parallel with the transmitter resistors, which changed the circuit form. As a result, the plagiarists suffered a lot and burned a lot of the originals.
I have been an electronic hardware engineer for seven years, and plagiarism is still very common in the industry. Here, I will tell you some ways to prevent plagiarism.
1. mcu disables Jtag to prevent software from being read out. Without software, even if the hardware is copied away, you need to develop your own software, so that people who get something for nothing will retreat.
second, this method is more harmful, so use it with caution! Let them copy it, just set a short circuit on the hardware, control it with software, and then update the software automatically at regular intervals. The person who copied your board will inevitably not get the authorization to update it, so a large number of equipment he produced may be scrapped in time, and it's no wonder that others.
cow dung seal, quick update, customized cpu, software encryption, to ensure that the cracking cost is high enough
The circuits that can be copied are all low-end designs, so it's really impossible to erase the model on the chip. Now, which circuit board doesn't have a CPU to package an fpga ... It's better to do it yourself if you want to copy it. . If you design a project, others might as well redesign it if they want to copy it. That's in place.
To prevent the super board from being marked with customized originals, ic pins can redefine the serial number. Resistors, capacitors and other chips and other random standard specifications and models. Software ambush cheat people
uses micro-processing, and then solidifies his own control program and encrypts it.
wouldn't it be nice to apply for a patent? Not to mention pcb, even ic can be reversed now, and it is impossible not to be copied < P > Reverse development, and no one can stop it! I met a finished circuit board in the 198s, and the effect was very good! Check the chip application circuit and expand the practical circuit, and the effect is better than the original one.