M.C. Escher, "Reptiles" – 1943
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This serial number check can be done using a simple local database at the Resource (website). Things get a bit more complicated if there are many Resources (say different websites), and you want to prevent credential re-use across all of them. The typical solution outsources serial number checks to some centralized service (or bulletin board) so that a user can’t use the same credential across many different sites.,这一点在雷电模拟器官方版本下载中也有详细论述