解鎖或加密PDF檔案：Colab PDF Protector / Unlocking or Encrypting PDF Files: Colab PDF Protector

PDF檔案的安全性加密與解除限制通常需要特別的軟體。如果我們只有手機的話，不妨來使用我開發的Colab PDF Protector，用Google Colab的腳本新增或移除PDF的安全性設定吧。

PDF file security encryption and decryption often require specialized software. If you only have a mobile phone, consider using my Colab PDF Protector, a Google Colab script designed to add or remove security settings from PDFs.