Question: what is the difference between tm (trademark) or (registered) and c (copyright)?
Answer: They both give notice of ownership of rights alerting potential infringers that the mark is being claimed as a trademark. They offer no real legal protection but can, however, be used as a deterrent. 'SM' means 'service mark' and is supposed to be used for services, whereas 'TM' (trademark) should be used for goods.