Objective-C Requires Chilkat v11.7.0+

Remove the Password and Encryption from a PDF

See more PDF Protection Examples

Demonstrates the removeEncryption operation, which saves the PDF with no encryption at all: no password, no restrictions. It needs owner rights, so the PDF is loaded with its owner password. As with every Protection operation, the change is applied when the file is written. Objective-C

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

CkoPdf *pdf = [[CkoPdf alloc] init];

//  Removing the encryption needs owner rights: load with the owner password.
pdf.OwnerPassword = @"owner-secret";
success = [pdf LoadFile: @"qa_data/pdf/encrypted_user_password.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

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

NSLog(@"%@%d",@"encrypted, as loaded: ",[jsonOut BoolOf: @"loaded.encrypted"]);
NSLog(@"%@%@",@"algorithm: ",[jsonOut StringOf: @"loaded.algorithm"]);

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

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

success = [pdf WriteFile: @"qa_output/minutes_unprotected.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

//  The result is an ordinary PDF that opens without a password.
CkoPdf *reader = [[CkoPdf alloc] init];
CkoJsonObject *info = [[CkoJsonObject alloc] init];
success = [reader PreLoadCheck: @"qa_output/minutes_unprotected.pdf" jsonOut: info];
if (success == NO) {
    NSLog(@"%@",reader.LastErrorText);
    return;
}

NSLog(@"%@%d",@"encrypted: ",[info BoolOf: @"encrypted"]);
success = [reader LoadFile: @"qa_output/minutes_unprotected.pdf"];
if (success == NO) {
    NSLog(@"%@",reader.LastErrorText);
    return;
}

NSLog(@"%@%d",@"pages: ",[reader.NumPages intValue]);

//  Sample output:

//  encrypted, as loaded: True
//  algorithm: rc4-128
//  will be saved encrypted: False
//  encrypted: False
//  pages: 1