Get - OpenXmlWatermark：获取字处理文档中的水印文本。
Get-OpenXmlWatermark: Gets watermark text from a Wordprocessing document.
经实验证明，对水印文本进行格式调整、特征修改甚至部分内容删除等操作均不能去除水印。
It shows according to experiments that the watermark cannot be wiped off with the format adjusting, characteristic amending or contents' deleting.
iText 库中的类用于以各种字体来生成 PDF 文本、在 PDF 文档中生成表格、为页添加水印等。
The iText library contains classes to generate PDF text in various fonts, generate tables in PDF document, add watermarks to pages, and so on.
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