Software protection method and device

The invention provides a software protection method and device, relates to the technical field of digital encryption, and aims to solve the problem of low security of a software authentication mode in the prior art. The method comprises the steps that an operation host sends an ith key request to an authentication server, the ith key request is used for requesting key information of an ith code snippet in M code snippets, the M code snippets are encrypted code snippets in target software, i is a positive integer, and M is a positive integer larger than 1; the operation host receives the ith secret key information sent by the authentication server; the operation host decrypts the ith code snippet according to the ith key information; wherein the normal operation condition of the target software in the operation host is that the operation host successfully decrypts the M code snippets. The embodiment of the invention is used in the process of operating the host to authenticate the software. 本申请提供一种软件保护方法及装置，涉及数