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Consider the following scenario:
Error: You do not have security rights to perform this operation
For more details and a link to the hotfix that resolves this issue see the following new Knowledge Base article:
KB978756 - Error message when you try to change a deployment template in System Center Configuration Manager 2007 SP1 or in System Center Configuration Manager 2007 SP2: "You do not have security rights to perform this operation"
J.C. Hornbeck | System Center Knowledge Engineer