Security features are built in, too. You can password-protect files, redact sensitive information, and add electronic signatures to contracts or forms. And when files get too large, the software can compress, merge, or split PDFs in just a few clicks.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
。whatsapp对此有专业解读
end-to-end encryption
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