How to disable digital signature removal in PDFs

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//
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//  Copyright © 2019-2026 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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class DisableRemovingDigitalSignatureExample: Example {
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    override init() {
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        super.init()
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        title = "Disable removing Digital Signature"
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        category = .forms
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        priority = 15
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let document = AssetLoader.writableDocument(for: "Signed Form.pdf", overrideIfExists: false)
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        return PDFViewController(document: document) {
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            // Set `allowDeletingDigitalSignatures` to false to disable removing of added Digital Signatures.
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            $0.allowRemovingDigitalSignatures = false
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        }
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    }
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}