Yep. That's not just a lich, it's a demilich, and it's got infinite imprisonment spells. The following should work to prevent imprisonment:
Slayer Change
Berserker Rage (I've heard conflicting reports on whether or not Barbarian Rage works)
Protection From Magic (scroll from Ribald's shop)
Spell Immunity: Abjuration
Protection from Undead
In addition there are several summons (wizard's eye comes to mind) that you should be able to stick in front of him and have him attack that he can't imprison while you have your way with him.
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