BOCA RATON, Fla. — Office Depot's board of directors have approved a rights agreement and declared a dividend distribution of one preferred stock purchase right for each outstanding share of company common stock. Each right initially represents the right to purchase 1/5,000th of a share of company preferred stock at $11.50. Also, initially, these purchase rights will not be exercisable and will trade with the shares of the company’s common stock. The rights agreement will expire on Oct. 23, 2013.