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....中,我们将学习如何为 PDF 文档添加密码以保护它们。我们还将了解如何以编程方式锁定相同的 PDF 文件。继续阅读 …...