NCR adopted a plan to deter a hostile takeover.

The “poison pill” plan would make the Dayton, Ohio-based maker of computers and information systems more difficult and expensive to acquire. Current stockholders will be issued rights to a new class of preferred stock. Those rights will be exercisable in the event that a suitor has acquired 20% of NCR common stock or intends an offer to purchase 30% of the shares. The plan meshes with existing measures, including an “anti-greenmail” provision and staggered terms for directors.