Is it permissible to sell toy cars that have been modified, knowing that they were published by people who have a paid subscription and did not cause harm to their manufacturer or consumer?

It is permissible to modify and sell cars under two conditions: First, that their designers do not prohibit modification or sale, because intellectual property rights and innovation are recognized in Islamic law. Second, that these cars are not sold for use in prohibited games, such as gambling, due to the prohibition of aiding in sin, and because selling something intended for unlawful use is impermissible.