Assuming drum parking brake, you should be able to free it off by a bit of force, reverse is usually best, if you don;t want to give the clutch too much hammer you could pull it backwards with a substantial vehicle, 4x4 in low would be perfect.
If it won't have it then suggest you remove the wheel and give the drum a few sharp clouts with a hammer, that should break the rust seal which is probably the problem following the severe prolonged drought..;)
Not sure if you can release the adjusters to help without removing the drum (cue obvious quips along the lines of if i could get the drum off etc), consult a Haynes for better info...hopefully you won't need to go that far.
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