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If a page in a Windows SharePoint Services 3.0 site contains more than one List View Web Part, and if the total number of uniquely secured items from these lists is larger than 1,000, security trimming is not honored in one or more of these Web Parts.
To resolve this problem, apply hotfix 957691 that is mentioned in the following Microsoft Knowledge Base article:
957691 Description of the Windows SharePoint Services 3.0 hotfix package (Sts.msp): October 28, 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.