I'd be wary of ignoring a C&D. There may be legal ramifications if you end up getting punished for infringement. I am not a lawyer. Please talk to a lawyer. An

I'd be wary of ignoring a C&D. There may be legal ramifications if you end up getting punished for infringement. I am not a lawyer. Please talk to a lawyer. Anyone on this board who is not a patent lawyer is talking out of their rear (including myself). Hopefully a real lawyer can comment soon.