.NET Core C# Requires Chilkat v11.7.0+

Extract Text from a PDF that Forbids Copying

See more PDF Text Extraction Examples

Demonstrates a PDF that opens without a password but whose permissions do not allow copying text. The "text", "markdown", "search" and "tables" operations fail with that reason; "assess" always works. Loading the PDF with the OwnerPassword property set grants owner rights, and extraction works. .NET Core C#

bool success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example (owner password: owner-secret; copying not permitted) is available at no_copy_permission.pdf

Chilkat.Pdf pdf = new Chilkat.Pdf();
Chilkat.JsonObject json = new Chilkat.JsonObject();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();

//  The PDF opens without a password.
success = pdf.LoadFile("qa_data/pdf/no_copy_permission.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

//  Extracting text is refused, because the PDF's permissions do not allow copying.
success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine("Extraction refused: " + pdf.LastErrorText);
}

//  "assess" reports only counts and ratings, never text, so it is always allowed.
success = pdf.ExtractText("assess",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("rating: " + jsonOut.StringOf("quality.rating"));

//  Load with the owner password to get owner rights, which include copying.
pdf.OwnerPassword = "owner-secret";
success = pdf.LoadFile("qa_data/pdf/no_copy_permission.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

success = pdf.ExtractText("text",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine(jsonOut.StringOf("text"));

//  Sample output:

//  Extraction refused: ChilkatLog:
//    ExtractText:
//      ...
//        The PDF's permissions do not allow copying or extracting text (load it with the owner password to extract).
//      ...
//  rating: good
//  Visitor Leaflet
//  
//  Welcome to the harbor lighthouse. The tower is open on weekends from July to September.
//  
//  Please keep to the marked paths and do not climb on the breakwater.
//  
//  The lantern room is closed in high winds.