Create a watermark version of the file. A watermark version is PDF file, but the whole content is added as pictures in 96 DPI resolution. Furthermore, the picture is annotated by a watermark text going diagonal across each page.

There is no way to increase the quality or remove the watermark text completely afterwards.

public bool CreateWatermark(
	string strFile,
	string strText
)

Public Function CreateWatermark ( _
	strFile As String, _
	strText As String _
) As Boolean

public:
bool CreateWatermark(
	String^ strFile, 
	String^ strText
)