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關於「PDF encryption」標籤，搜尋引擎有相關的訊息討論：
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- 1免費PDF 密碼保護| Adobe Acrobat (台灣)
- 2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。
- 3How to Password Protect PDF Documents
How to Password Protect Digitally Signed PDF Documents. 1. Open the PDF and choose File > Print >...
- 4Password Protect PDF - Encrypt your PDF Online - Soda PDF
Write out or encrypt your PDF file: choose the password you wish to use to protect your file. Ent...
- 5Protect PDF - Protect your PDF documents online - PDF2Go
