It wouldn't be siezed or it would have probably caught alight or at least had the grease running out of the hub, more like just dragging a shoe, try giving the hand brake wire a few good jerks and that should set things right, sometimes the lever doesn't release fully especially if the handbrake has been on for months on end or if very dirty the crap can cake up and a chunk can just pack things out.
Jack up wheel and give it a spin first, if it has a scraping sound them its a brake shoe but if it's just hard to turn but reasonably silent then the bearings too tight more than likely.
Either way check it all out before going again as they can turn nasty quickly.
If just scraping and the cable rattle doesn't clear it then grab a screwdriver and adjust it thru the plug hole on bottom of the backing plate, you will have to figure out which way as I can never remember..................... The bearing, just knock the cap off, remove split pin and loosen the nut to the next pin hole, spin wheel to check how free it is and give wheel a shake at 1200/0600, if it knocks then its too loose.