To stop people using the embed with no credit change your embed code in view_video.tpl and success.tpl to:

<TEXTAREA name=video_play ROWS="3" COLS="45"
onclick=javascript:document.linkForm.video_play.fo cus();document.linkForm.video_play.select();
readOnly><IFRAME vspace="0" hspace="0" allowtransparency="true" scrolling="no" marginwidth="0" marginheight="0" frameborder="0" style="border:0px;" width="435" height="370" SRC="{$baseurl}/show.php?id={$vinfo[0].VID}"></IFRAME>
(YourSiteInfoHere)Â*Â*<a href="http://www.(yourSite).com/recent/" target="_blank">Free
Porn</a>Â*Â*<a href="http://(yourSite).com">http://(yourSite).com</a></TEXTAREA>

Then above where it says embed stuff, just put removal of any part of embed is a violation of usage!.