Keep in mind: If you do something that bothers Lego or any of the rights holders for their tie-ins, you have a problem. If you have $1M and 2-5 years to spend o

Keep in mind: If you do something that bothers Lego or any of the rights holders for their tie-ins, you have a problem. If you have $1M and 2-5 years to spend on litigation, a court might be able to determine exactly how much of a problem you have. But if you don't have that much time and money, you have an insurmountable problem. All you can do is cease & desist. For example, the case of whether the Java API is copyrightable has been going on for 10 years and we still don't know the answer. Google and Oracle can afford to duke it out for that long, but you probably can't. So exactly what the law allows only matters if you're prepared to litigate. Otherwise, plan A should be to not bother anyone. A strategy that sometimes works is to proactively reach out and talk about how your site will be good free marketing for their products.