What does "redband trailer/red band trailer"mean?

@applepod (224)
Malaysia
July 8, 2009 1:31pm CST
for example,Resident Evil:Extinction has a red band trailer,but I don't know what does it mean,can anybody answer me?
1 response
asalie
@asalie (8)
• United States
8 Jul 09
Red Band trailers means that the preview or trailer itself is rated R so they cannot be shown before movies that have any other rating besides R or NC-17