| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image formation system which can fully secure security, when transmitting printing data to an image formation system via a network. <P>SOLUTION: When the CPU usage rates of personal computers 212 and 213 is more than 50%, or when the CPU usage rates of an image formation device 220 is more than 50%, the personal computers 212 and 213 encrypt PDL data by a secret key method, and the image formation device 220 decrypts encryption data by using a secret key, so as to lighten the load. On the one hand, when the CPU usage rates of personal computers 212 and 213 is 50% or less and the CPU usage rates of the image formation device 220 is 50% or less, the personal computers 212 and 213 encrypt the PDL data by a public key, and the image formation device 220 decrypts the encryption data by using a public-key encryption method, so that security may be raised even if the load is heavy. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
