hey!! i fixed the problem for anyone would need to know, if u have a song you want to tag it with the release date and the copyright information and want that info to show in iPod here's how:
-first tag the song with this tag (ITUNESPURCHASEDATE) using View>Extended Tags
and add any value you want as the purchase date e.g. (2011-09-14 05:58:30)
this will make the file behaves as a purchased file.
-then write the release date in the YEAR tag with this format YYYY-MM-DDThh:mm:ssZ
and if you want to add the copyright info too you can by adding the tag (COPYRIGHT) and write in the value you want.
i came to this after alot of tries and effort hope you'll find it helpful..!!
thank you all for your collaboration it's appreciated..