There is a program out there for the MAC called "PopCharPro" that will put an icon on your top bar to make the charators you want. It does cost sometihng I forget what though, However I have created a "Simple Text" document with those charactors in it and whenever I need one all I do is open that doc up and copy and paste.
In Windows their is a file with all these on there but since I am not at a Windows computer right now I don't remember the file.
If all you want is the ® hold your option key down and hit "R", © is option and the "G" key. This will work on the MAC.
Tony Perkins