GroupDocs.Watermark allows you to load password-protected documents and load documents from different sources.
For more details please refer to the following guides:
You may easily run the code above and see the feature in action in our GitHub examples:
Free online document watermarking App
Along with full featured .NET library we provide simple, but powerful free Apps.
You are welcome to add watermark to PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our free online Free Online Document Watermarking App.