Document Automation APIs to enrich .NET and Java applications to view, edit, annotate, convert, compare, e-sign, parse, split, merge, redact, or classify documents of almost all the popular file formats....在本文中,我们将看到 如何为 PDF 文档添加密码保护以使用 C# 锁定它们 。此外,我们将 更改现有密码 并学习...