You have no idea what you are talking about. For a start no-one is talking about modifying the driver. Secondly modifying a closed source driver is not illegal (at least in most jurisdictions), just difficult, however distributing the changes may be depending on how it is done, but if all that is distributed was a patch file of the changes and not the whole driver it should be legal. Thirdly, if you think modifying something you own is immoral you need to re-evaluate your morals, most people wouldn't consider modifying something they had come into possession of legitimately immoral. Finally, the touchscreen driver isn't owned or made by Sony or even closed source,