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 In daily work, we encrypt important documents and set user access permissions, which are not accessible to other external personnel. Only users who have obtained this permission are eligible to open documents. In addition, restricting users' access greatly prevents those who intentionally tamper with or copy the content, thereby improving the security of the document. At the same time, another major role of document encryption is to prevent loss, as there may be situations where employees intentionally or unintentionally delete documents during business trips or resignations, resulting in document loss and causing a certain impact on the company's business and image. So how can we encrypt PDF documents? How to decrypt a document after encrypting it? The following article provides a detailed introduction to how to programmatically encrypt or decrypt PDF documents through Java code. Encrypt a PDF File with Password Remove Password to Decrypt a PDF File Programming Environm...