Z:gnu-www-ja-limit-patent-effect--a38eaa-This approach doesn't entirely/en

This approach doesn't entirely invalidate existing computational idea patents, because they would continue to apply to implementations using special-purpose hardware. This is an advantage because it eliminates an argument against the legal validity of the plan. The US passed a law some years ago shielding surgeons from patent lawsuits, so that even if surgical procedures are patented, surgeons are safe. That provides a precedent for this solution.