Entry |
---|
"Secure Document Feature for Copy Machines", IBM Tech. Disc. Bull., vol. 15, No. 9, Feb. 73, pp. 2736, 2737. |
"Secure Document Feature for Copy Machines", IBM Tech. Disc. Bull., vol. 17, No. 11, Apr. 75, pp. 3198, 3199. |
"Preventing Copying of Classified Information", IBM Tech. Disc. Bull., vol. 19, No. 4, Sep. 76, pp. 1469, 1470. |
"Unauthorized Copy Prevention", IBM Tech. Disc. Bull., vol. 15, No. 12, May 73, p. 3642. |