TM you dont have to register a TM(well the fact is you just cant or it would be the R symbol for registered) is not the same as
® and means your using a name but the name is not registered. Why
® is for
Registered~
Far as copyright once you make/produce/record/write something you have copy right on that whether its registered or not and no need to register it but you can of course if you feel the need but your not any more protected but can make protecting it easier much like an
® that is registered~ Regardless if its registered or not you still are the copyright holder and you have a copyright by default on your works and nothing else is legally needed
so make a pretty pixel shirt or sing a little song or make a pretty poem and use that Circle C~
You can register your copyright by filing a simple form and depositing one or two samples of the work (depending on what it is) with the U.S. Copyright Office. There are different forms for different types of works -- for example, form TX is for literary works while form VA is for a visual art work.
http://copyright.gov/eco/