If a program was available to "hack" the EXIF data, then there would be no way to guarantee that an image was un-manipulated in some way. This is critical for work that I do in law enforcement in keeping "original" images in pristine condition for court purposes.
I'm not being critical, Fritz, just asking..... 
ADDUM,
I remember now, that I have ones found a program that could manipulate
ALL the EXIF data.
But it is so long ago , and it was not freeware, and I do not know the name anymore.
I will look in My Cilpmate remembers if I had saved the name of the program.
If I find it , I let you know.
Frits