I've read about patent problems concerning NdFeB magnets. Are your magnets licensed?
NdFeB magnets are a relatively new invention--they first became commercially available in 1984. General Motors held the patent, and some hard disc drive manufacturers were indeed sued over using unlicensed NdFeB magnets. Since then, the patent has been sold to Sumitomo, who is making the license easily available to magnet manufacturers worldwide. All NdFeB magnets are currently protected under international patent. ALL of our magnets are either new, legal, licensed material, or surplus from various industries.