Activision is taking defensive measures to ward off any unwanted takeover bids as it undergoes a major reorganization. The company is enacting a stockholder rights measure granting shareholders additional stock or compensation at rate roughly double their current holdings, but with the new rights kicking in only if someone makes a move to acquire 15 percent or more of the company. Those already holding stakes of better than 15 percent do not trigger the rights plan. Activision is in the midst of a shakeup that will focus the publisher's business on Internet and next-generation console games.