The only thing I see 'ripped' from both works is the overlayed dots in the bottom right corner. Other than that it seems to be original.
I don't think using a texture in a similiar place as someone else has done it counts as 'ripping'. It just borders plagirism.
EDIT: Well, when you look at it closer. It's as if he has copied some areas from your signature and used them in a different way on his. But it's still not classed as 'ripping' since that means to completely copy a graphic pixel for pixel.