I'd like to add the following header into the C files: This software is in the public domain. You may freely use, modify and/or distribute it. is this acceptable?
OK.
. It is probably caused by the special characters in your name, which were put unencoded into the man page. Is is acceptable to spell your name just Peter Szabo?
No. In HTML, it is Péter Szabó -- please add this to the man page in the proper encoding, if possible.