One Major point in the duplication of Bruce's Products.... There is a Legal statement posted in plain order on the HA website and due to such, purchase of any of his products binds the buyer to the restrictions of the posted Legal Notice. There are restrictions in most states that allow a limited sale of NON BUSINESS related work from said materials, but any business related sales must adhere to the posted Legal Statement or be open to legal settlement.
I suggest a visit to the US Patent Office Web Site and look up Copy write.

Like Kling said not everything that is legal is ethical and vs-vrs.