Don't worry. We de-duplicate non-anonymous signatures automatically, and anonymous signatures within 24 hours (before personal data is deleted). For anonymous signatories beyond 24 hours, we cannot verify there are no duplicates, though there is one human who manually reads all signatures and will try hard to notice and correct any abuse of the system.
第六十四条 船舶擅自进入、停靠国家禁止、限制进入的水域或者岛屿的，对船舶负责人及有关责任人员处一千元以上二千元以下罚款；情节严重的，处五日以下拘留，可以并处二千元以下罚款。，推荐阅读雷电模拟器官方版本下载获取更多信息
A developer creates an API key and embeds it in a website for Maps. (At that point, the key is harmless.) ，详情可参考爱思助手下载最新版本
Google on Friday unveiled its plan for its Chrome browser to secure HTTPS certificates against quantum computer attacks without breaking the Internet.