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Once the idea is patented (and usually earlier if it is published), the patent is freely available for anyone to read, including those considering developing in the technology area.
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So how does that work in practice? Let’s say I have developed a new video compression technique which I believe to be original and superior to existing methods. What’s my next step?
If I just go ahead and attempt to productise my invention, it is virtually certain that I will be sued by a large number of people who hold patents on video compression, even if there is only a little overlap between my method and theirs. So I first need to search for patents I might be unknowingly violating. Of course, patents are written by lawyers, for lawyers; they are not intended to be understood by technical people. So I’m going to have to hire a patent lawyer, explain my invention to her, and then pay her a lot of money to spend a lot of time searching through the many thousands of data compression patents and investigating every one which could plausibly be stretched to cover my invention.
That’s a lot of time and energy I’m not spending on improving my product. In fact, I may even decide to give up on the idea altogether and go find another hobby. Can you see how one might have some doubts about whether this system actually encourages innovation?
Now, in a world without patents, I could turn my invention into a product suitable for end-users, which is usually the difficult part anyway, and try to make money off it in whatever way I saw fit. Simply keeping the source code secret would discourage casual copying, copyright would prevent people from blatantly stealing my product, and by the time my competitors had reverse-engineered my work and developed their own “clean-room” implementation, I would be ready to hit the market with version 2.0 of my product. Doesn’t that sound like a more fruitful climate for fostering innovation and benefiting consumers?
Also, in the case of the GIF patent, it was actually well-known that Compuserve had a patent on the compression technique. But they never tried to enforce it, and in fact did everything to encourage the adoption of GIF as a de-facto open standard. But then after many years, Unisys, the new owner of the patent, suddenly announced that they were going to take a hard line on “protecting their intellectual property”. In other areas of civil law, I believe (but IANAL) that this is called estoppel: if you allow something to happen openly and with your tacit approval, you cannot then suddenly turn around and sue for damages. But apparently, either the rules are different in the field of patents, or maybe Unisys would have eventually lost a court case but the mere threat of legal action was enough to cause some serious headaches for everybody involved in the field of image manipulation software.