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This paper is dealing with the stochastic maintenance method for the software protection by using the closed queueing model with the unreliable backups. The method shows the theoretical software protection scheme in the security perspective. If software application modules are represented as backups under proposed architecture, the system can be solved by using the stochastic maintenance model with main unreliable and random auxiliary spare resources with replacement policies. In addition, the practical approach of technology enhancement in software engineering by using the technology innovation tool that is called TRIZ. The results are demonstrated in the framework of optimized software allocation problems with unreliable backups.