I recently bought a product, let's say a car, with limitations intentionally introduced to the design, for example an electronic speed limiter. Being a bit of a tinkerer, I messed with my model until I figured out how to remove this limitation (i.e. remove the electronic speed limiter). If I were to publish this information online, telling other people how to modify their models, would it be legal?
As another example, let's say I figured out how to raise the power on a brand-name microwave, or increase the cooking speed of a rice cooker. Provided the end result isn't in violation of any particular safety laws (and assume for the purpose that they do not), can I legally publish the information of how to do so?