(By Luo Yanjie) Abstract: In software infringement lawsuits, the plaintiff shall demonstrate itself as the rights holder of the software involved and the “substantial similarity” of the defendant’s software with its own. On the opposite side of the coin, once a defendant counters by claiming that no infringements have been made, it shall present relevant evidence; otherwise, it shall bear any disadvantages resulting from the failure to present proof of a lack of infringement. As for the case described in this essay, although it involves open source software, no definitive solution has yet been made to solve this particular legal program, to our disappointment.