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Embedded and Microcontrollers
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Embedded and Microcontrollers
Embedded Forum Potting a circuit, how reasonable can this action protect IP?
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  • protecting_ip
  • embedded
  • development
  • patent
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Potting a circuit, how reasonable can this action protect IP?

Catwell
Catwell over 15 years ago
It's a cold, cut throat world out there. Designs are stolen left and right. But, how can one protect a circuit design from IP theft and reverse engineering?
I recently developed a system for a company, and they were concerned that the circuit design could easily be stolen. It was true. Just by looking at the PCB you could easily see the layout, the chips used, and component placement. Unfortunately, patenting was not an option due to several factors.
My solution: Pot the electronics. I figure, might as well make it as hard to reverse engineer as possible.
 
 
Has anyone ever de-potted any electronics, and how did it go? From my experience, it is exceedingly difficult and destroys the circuits. But perhaps I am not learned in the art of corporate espionage.
 
 
Is there another way to make it impossible to see, get at, a circuit?
 
 
Cabe
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  • enrico.migchels
    0 enrico.migchels over 15 years ago

    Hi Cabe,

     

    Potting is indeed a nice way of making a circuit diagram less visible. But be aware that, as all materials suffer from thermal expansion you might destroy components under normal use. A nice example is ferrite in Epoxy resin. So, use materials that match the expension of the components used.

     

    I would say: add a microcontroller and protect the firmware from reading. That is really the ultimite black box. What you can also do (for larger product quantities) is asking an chip supplier to mark the chip with a decicated codenumber (datasheet will not be traceble). If the reverse engineer has knowlegde about the type of circuit used he could figure out what controller is used anyway (but it will take a lot of extra time). Add extra layers in a pcb is also interesting, but you can sand down the pcb and computer scan the layers. Mark the layer with a color and paste all layer on top of each other on the computer to make the electrical routing visible from layer to layer. You see: reverse engineering is always possible. :-)

     

    Best regards,

     

    Enrico Migchels

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  • Catwell
    0 Catwell over 15 years ago in reply to enrico.migchels

    Enrico,

     

    Thank you, those are good suggestions. Some designs I have are not microcontroller based, so I was looking for a way to protect that too.

     

     

    A determined person will break any security. I just want to make it harder to do and stop the casual thief.

     

    Cabe

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  • Catwell
    0 Catwell over 15 years ago in reply to enrico.migchels

    Enrico,

     

    Thank you, those are good suggestions. Some designs I have are not microcontroller based, so I was looking for a way to protect that too.

     

     

    A determined person will break any security. I just want to make it harder to do and stop the casual thief.

     

    Cabe

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