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- 1Home - PDFEncrypt - Password protect PDF files for free ...
PDFEncrypt is a free, open-source utility to encrypt PDF files using standard PDF encryption algo...
- 2免費PDF 密碼保護| Adobe Acrobat (台灣)
- 3安全地在網上加密PDF
免費網上PDF加密服務- 以AES 128-bit高階加密標準為你的PDF檔案加密。無檔案大小限制，無廣告水印，而且安全易用。
- 4How to Password Protect PDF Documents
How to Password Protect Digitally Signed PDF Documents. 1. Open the PDF and choose File > Print >...
- 5How to encrypt a PDF document
Confidential PDF documents can be encrypted and protected with a password. Only people who know t...
