Remove Password from PDF using Swift for iOS

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//
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//  Copyright © 2017-2025 PSPDFKit GmbH. All rights reserved.
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//
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//  The Nutrient sample applications are licensed with a modified BSD license.
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//  Please see License for details. This notice may not be removed from this file.
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//
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import PSPDFKit
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import PSPDFKitUI
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/// Shows how to use the Document Processor to remove password protection from a
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/// document. When printing a password protected document, the system printing
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/// dialog will ask the user for the password before printing. To work around
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/// this, we first create a duplicate PDF file without the password, and then
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/// use that file to print.
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///
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/// Document Permissions guide:
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/// https://www.nutrient.io/guides/ios/features/document-permissions/
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class RemovePasswordExample: Example {
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    override init() {
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        super.init()
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        title = "Remove password protection from document"
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        contentDescription = "Example shows how to use the document processor to remove password protection from a document."
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        category = .security
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.document(for: "Password-Protected.pdf")
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        let outputURL = FileHelper.temporaryPDFFileURL(prefix: "unlocked")
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        removePasswordProtectionFromDocument(document: document, password: "test123", outputURL: outputURL)
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        let unlockedDocument = Document(url: outputURL)
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        return PDFViewController(document: unlockedDocument)
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    }
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    func removePasswordProtectionFromDocument(document: Document, password: String, outputURL: URL) {
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        // We need to unlock the document before doing anything else.
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        document.unlock(withPassword: password)
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        do {
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            // Create a processor configuration and document security options.
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            guard let processorConfiguration = Processor.Configuration(document: document) else {
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                print("Error: Could not create a processor configuration.")
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                return
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            }
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            // Here, we set the owner and user password to nil because we want to remove the password.
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            let documentSecurityOptions = try Document.SecurityOptions(ownerPassword: nil, userPassword: nil, keyLength: Document.SecurityOptionsKeyLengthAutomatic, permissions: [.annotationsAndForms, .printing, .printHighQuality])
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            // Create a processor and write the file with the permissions applied.
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            let processor = Processor(configuration: processorConfiguration, securityOptions: documentSecurityOptions)
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            try processor.write(toFileURL: outputURL)
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        } catch {
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            print(error)
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        }
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    }
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}