I've been reading about software licenses for a few hours because of the reason that I want to release a software commercially. I'm no lawyer and I'm incredibly bad at understanding licenses.
Perhaps my question is very trivial but anyways pardon me for my ignorance. So the question is if I include any standard C library header (ex. math.h) am I supposed to release it (my program) under GPL? As the notice at the top says so, or is that notice targeted for people MODIFYING it and not USING it? O and BTW, I'm using MinGW/GCC and I've read that you are not obliged to release it under GPL as long as only the compiler is used, well then how about the Standard C Headers that have seperate copyright notices in them?
PS: If I am obliged to release it under GPL, how can I make a program to be released commercially without relying on that library/header that I need (that is in the standard C headers)?