If it really bothers you, after downloading open the .sfv file with notepad and delete:
;Q2-1c5989f9621f09e
;Q2-MORJf+yzxQE=
;Q2-//8=
;Q2-MORJf+yzxQE=
;Q2-//8=
and re-save. You now have a perfect copy (actually don't burn the "Torrent downloaded from Demonoid.com.txt" file either).