Requirements for Exclusion Key Rules
Keep in mind the following requirements when configuring exclusion key rules:
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Before adding an exclusion key rule to an existing policy, you must disable all GuardPoints protected with the policy. Log on to the CipherTrust Manager to disable the GuardPoint. 
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You cannot choose a versioned key for the key in an exclusion key rule. Only non-versioned keys or clear_key(no encryption) are valid for exclusion key rules.
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All exclusion key rules must be above all LDT transformation key rules in the Key Rules area in the policy.