I'm about to face an ugly situation with a woman who is continuously claiming copyright infringements by other artists on her work. She's trying to claim I've now done this, which I haven't. So I have a feeling there will be a cease and desist letter on the way. My question is, does it have to be sent by a lawyer or notorized by a lawyer to be valid? And I have reason to believe that she may have a friend of hers impersonating a lawyer. In order to follow through with it I would want to make sure it was coming from a real law office and a real legal representative. What should I do in this case? I'm considering going to the police to at least document her nonsense. I've never had to deal with this before.
Also, I should mention, she lives in Michigan, U.S.A. and I live in Ontario Canada.