Copyright evaluation is the work of judging the similarity between the product of the original developer and works suspected of duplication. In order to keep the fair and objective verification, the developer and the developer's object should be submitted, but in most cases, it is difficult to compare one-on-one with the unfair disclosure of data by the suspect. In particular, in the case of an embedded system, a kernel of the Linux OS is mounted and an application program is made to be executed using the device driver. When such a system is duplicated, evaluation results can not be obtained by the conventional comparison method, the difference of the operating system, and the structural difference of the program according to the nguage used make analysis difficult. By this reason, the similarity comparison result is different because of the high proportion of open programs. In this paper, we compare and analyze the kernel source and device driver of two products.