I was going to ask for it, but found an easy and working solution inbetween, here is how I did, after reading this post at longtail video support:
1) downloaded the player from - http://www.longtailvideo.com/players/jw-flv-player/, and uncheck "Include Viral, a video sharing plugin"
2) Upload the player.swf and jwplayer.js files that where in the .zip file to your site, replacing the player.swf and jwplayer.js files that are there currently.
3) Clear your cache. It will be gone now.
Beeing able to activate/deactivate this option would be eleganter for a next version...