This article explains how to get collection of changes between compared documents when using GroupDocs.Comparison for .NET....Assembly Product Solution GroupDocs...
The SetProperties method is used to update or add metadata. You can easily add metadata to photos, pdfs or you can update or add data to mp3 files....Assembly Product Solution GroupDocs...
This article will help, if you want to add watermark to images inside a document then it can be possible using GroupDocs.Watermark for Java....Assembly Product Solution GroupDocs...
The easiest way to remove metadata properties from a file is to use corresponding tags that allow you to locate the desired properties across all metadata packages....Assembly Product Solution GroupDocs...