pdf怎麼添加水印？四種為PDF添加水印的方法介紹！

{"info":{"title":{"content":"pdf怎麼添加水印？四種為PDF添加水印的方法介紹！","en":"How to add watermark to PDF?4 ways to add watermark to PDF!"},"description":{"content":"pdf怎麼添加水印？PDF檔案作為一種廣泛使用的檔案格式，确實能夠有效地保護我們的文檔内容，但在某些情況下，它也可能會面...","en":"As a widely used file format, PDF file can indeed effectively protect the content of our documents, but in some cases, it may also be faceted."}},"items":[]}