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Commitments And Contingencies
12 Months Ended
Oct. 31, 2011
Commitments And Contingencies [Abstract]  
Commitments And Contingencies
9. Commitments and Contingencies

Under the Trust's organizational documents, the Sponsor is indemnified against any liability or expense it incurs without negligence, bad faith or willful misconduct on its part. The Trust's maximum exposure under this arrangement is unknown, as this would involve future claims that may be made against the Trust that have not yet occurred.