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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 PdfDocument = Document.Load(Of PdfDocument)(Utilities.MapSourceFilePath(FilePath))
    ' Initialize search criteria
    Dim imageSearchCriteria As ImageSearchCriteria = New ImageDctHashSearchCriteria("D:\logo.png")
    Dim textSearchCriteria As New TextSearchCriteria("Company Name")

    Dim possibleWatermarks As PossibleWatermarkCollection = doc.Pages(0).FindWatermarks(imageSearchCriteria.[Or](textSearchCriteria))

    ' Remove all found watermarks
    For i As Object = possibleWatermarks.Count - 1 To 0 Step -1
        possibleWatermarks.RemoveAt(i)
    Next

    doc.Save()
End Using