SMIL player can do MD5 check while prefetch media.
While MD5 mismatch :
(1) media will be abandoned
(2) player will report checksum error in Player_events
<prefetch src="foo.wmv"> <param name="md5" value="F94C9F475265682756530E670F27FC37" /> </prefetch>
Applicable device :
IAdea XMP-3250 series player ( firmware 3.4 or higher ) and XDS-1950/2450 signboard
IAdea XMP-2200 series player ( firmware 4.8 or higher ) and XDS-1060 series signboard