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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As Document = Document.Load(Utilities.MapSourceFilePath(PptFilePath))
    ' Search by exact string
    Dim textSearchCriteria As New TextSearchCriteria("© 2017")

    ' Find all possible watermarks containing some specific text
    Dim possibleWatermarks As PossibleWatermarkCollection = doc.FindWatermarks(textSearchCriteria)
End Using