如何限制 PDF 的文字選取拷貝？如何限制 PDF 的列印呢？坦白說徒法煉鋼的方式我還真的不知道，不過這次限時免費的 Batch PDF Encryp...
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Free online tool to password protect PDF files and to set PDF security settings. No quality loss. Without installation. Without registration. ...（以下省略）
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