Objective-C Requires Chilkat v11.7.0+

PDF Owner Password vs. User Password

See more PDF Protection Examples

Demonstrates the difference between the two passwords of an encrypted PDF. Either one opens the file. The user password gives the rights the permissions grant. The owner password gives owner rights: no restriction applies, and it is the only one that lets the security be changed or removed. Every Protection operation except getInfo needs owner rights, and Chilkat does not offer a way around that. Objective-C

#import <CkoJsonObject.h>
#import <CkoPdf.h>

BOOL success = NO;

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

//  The PDF used in this example is available at encrypted_user_password.pdf

CkoJsonObject *json = [[CkoJsonObject alloc] init];
CkoJsonObject *jsonOut = [[CkoJsonObject alloc] init];

//  Opened with the user password.
CkoPdf *user = [[CkoPdf alloc] init];
user.UserPassword = @"secret";
success = [user LoadFile: @"qa_data/pdf/encrypted_user_password.pdf"];
if (success == NO) {
    NSLog(@"%@",user.LastErrorText);
    return;
}

success = [user Protection: @"getInfo" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",user.LastErrorText);
    return;
}

NSLog(@"%@%@",@"opened with: ",[jsonOut StringOf: @"loaded.openedWith"]);

//  Changing the security needs owner rights, so this is refused.
success = [user Protection: @"removeEncryption" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",@"removeEncryption was refused: the PDF was not opened with its owner password.");
}

//  Opened with the owner password.
CkoPdf *owner = [[CkoPdf alloc] init];
owner.OwnerPassword = @"owner-secret";
success = [owner LoadFile: @"qa_data/pdf/encrypted_user_password.pdf"];
if (success == NO) {
    NSLog(@"%@",owner.LastErrorText);
    return;
}

success = [owner Protection: @"getInfo" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",owner.LastErrorText);
    return;
}

NSLog(@"%@%@",@"opened with: ",[jsonOut StringOf: @"loaded.openedWith"]);

//  Now it is allowed.
success = [owner Protection: @"removeEncryption" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",owner.LastErrorText);
    return;
}

NSLog(@"%@%d",@"removeEncryption succeeded; will be saved encrypted: ",[jsonOut BoolOf: @"pending.encrypted"]);

//  Sample output:

//  opened with: user
//  removeEncryption was refused: the PDF was not opened with its owner password.
//  opened with: owner
//  removeEncryption succeeded; will be saved encrypted: False