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断网后能否使用？为什么专业版需要联网授权？
断网时的使用范围
免费功能和已有项目的查看、搜索、基础编辑、删除、备份和导出不依赖授权服务器在线。网页、在线资料等内容需要网络。
专业版首次激活需联网。有效设备授权期间可离线新建项目和使用专业功能，最长 7 天，且不超过试用或订阅的到期时间。永久授权同样需要定期联网验证。
离线授权到期
保存工作后检查网络和 Windows 时间，恢复联网验证。新建项目需要有效专业授权，免费功能和已有项目仍可继续使用；永久授权的设备凭证到期无需重新购买。
解绑、退款或撤销后，离线设备的原授权可剩余至其原到期时间。修改时间或复制授权文件不会延长授权。