i have come across lots of adware/spyware and trojan kind of programs in digit's stuff especially those ultimate freeware cd's which they had given a long time back (around 10 cds of stuff for home,multimedia.internet,etc) ... most of the screensavers and themes are affected with spyware. and ya it is my advise that u scan the cd/dvd b efore installing anything as u may never know what infection ur pc may catch.
i think there is something mentioned in the agreement regarding adware etc. time to read it and see.