. 201d all purchases under a rule 10b5-1 plan must be made accord- ing to a predefined plan that is established when the firm is not aware of material nonpublic information . as of december 31 , 2008 , $ 6.2 billion of authorized repurchase capacity remained under the current stock repurchase program . for a discussion of restrictions on stock repurchases , see capital purchase program on page 84 and note 24 on pages 205 2013206 of this annual report