GroupDocs.Watermark API allows you to search the possible watermarks placed in any document. You can also search the watermarks that are added using some third-party tool. The found possible watermarks can be removed or their properties can be changed. For more details please refer to the following guides:
Searching watermarks Modifing found watermark properties Removing found watermarks...Parser Product Solution GroupDocs...
Check this guide and learn how to manage document security for PDF, Word, Excel, PowerPoint file types - add password, update password, remove password using GroupDocs.Merger for Java....Parser Product Solution GroupDocs...
Working with XMP metadata GroupDocs.Metadata for Java also allows managing XMP metadata in MP3 files. For more details please refer to the following guide: Working with XMP metadata...Parser Product Solution GroupDocs...
GroupDocs.Metadata provides different ways to save a file with updated metadata.
Please refer to the following guides to know more about all overloads of the Save method:...Parser Product Solution GroupDocs...
This section decsribes how to add digital signature to pdf, docx, pptx, xlsx and many more with GroupDocs.Signature for .NET library...Parser Product Solution GroupDocs...