I run an acting school and as part of our program we organised a casting director and an actor trainer to come along to teach our students. As part of our marketing the program to our students and the public, we used a photo or logo of the place where the session is to be held and it is also a casting studio as well as a photo of the actor to be holding the session. Having told my mum that I had 4 places waiting to be filled, my mum who owns a small business of her own within her neighbourhood, decided to create a flyer and on her way to Safeway in the evening placed it on a couple of cars windscreens. Little did she know she handed it to the sister of the casting director,seeing her logo on the flyer she was very angry and appalled. My mum only did a few as it was on her way to the shops it was where she parked a couple of cars. The casting director is now threatening to sue me because I have violated her terms and conditions, which when I retread stated nothing about advertising or the use of her logo ,and when I asked my mum where she got the picture she said on google which when we researched further was being used by another school to advertise their program.I think perhaps she is more angry that it was on windscreens on cars. Under those circumstances what should someone do? It was clearly unintentional to defame anyone and nothing stated anything defamatory about them or to infringe copyright, it was just being used as promotion for the upcoming program.