Adobe Acrobat (旧インターフェース) で PDF に透かしを挿入する方法
Adobe Acrobat で PDF に透かしを追加する方法 (更新されたインターフェース)
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Adobe Acrobatを使用してPDFに透かしを追加する方法
How to Insert Watermarks on Specific Pages in pdf using adobe acrobat pro dc
