A semi-dynamic multiple watermarking schemefor java applications

Software protection and security has been a more and more important issue. In order to prevent software from unauthorized use and modification, a great many techniques have been proposed and developed. In this paper, we address this issue through a prevention technique called software watermarking, and we propose a novel software watermarking scheme, which can embed multiple non-interfering watermarks into the same program. Unlike published schemes, this scheme encodes the watermark into mapping functions and then embeds the mapping codes, which are generated from these functions, into the program at the articulation points of its control flow graph. The extraction in this scheme, which is based on dynamically loading a reconstructed program to recover the watermark, is also a novel approach to the software watermarking field. Experimental results indicate that the size and performance overheads caused by this scheme can keep steady.