[Xeen]

It sounds like one of two things has happened.
1) The Drum has rust welded itself to the Hub on the axle shaft.
If this is the case you can take a hand sledge and strike the drum around the edge alternating between the top and face as you go around the perimeter of the drum, be careful not to hit the wheel studs.
2) If the drums are seized and don't turn then there are broken parts inside and the brake shoes are being forced against the drum causing it to seize.
You can get a drum puller and force it off, you can borrow one from O'reillys.