If it is encoded into the video, you won’t get rid of it. Not without causing more picture quality issues than you solve.
I suggest using a free program called BD Rebuilder to convert blu ray to dvd-video. It will also annihilate DVDFab in the quality of the conversion.
You’ll need to start with an unencrypted blu ray, since BD Rebuilder does not include any type of decryption capability. Here is a guide for doing this type of conversion in BD Rebuilder: http://club.myce.com/f32/bd-rebuilder-guide-conversion-blu-ray-other-formats-326975/