Dwm, surf, and probably more suckless projects contain the copyright symbol as UTF-8 character. In most cases, if not always, it is the only non-ASCII character in those files.
I suggest to replace it with ``Copyright'' or ``Copyright (c)''. (``(c)'' alone is not enough from the lawyer POV, AFAIK.) Although most modern software can deal with UTF-8 chars, why use them when not necessary? In this case, we'll not lose anything but may avoid problems. What speaks against? meillo