Probability algorithm of digital watermark´s relationship and analysis

First of all, the concept of ODRM would be offered, and in order to meet the requirements of ODRM. This thesis would analyze Relation Space-Time Tree Model of digital watermarking; Then put forward the probability algorithm of digital watermark´s relationship ,noted the relationship of digital watermark by calculating the correlative coefficients of two dimensional random variable. The algorithm would break instability of the previous algorithm by adding a time stamp information when distribution and lending, so the probability of failing to determine relationship would decrease exponentially, thus to enhance the stability of the digital watermark algorithm. At the same time, the algorithm would be more suitable for the environment of ODRM.