Terms of Use

1Agreement to these terms

These Terms of Use (“Terms”) are a legal agreement between you and Zydeno, the developer of Ductivane (“we”, “us”). They apply to the Ductivane app for Android, its updates and everything it shows or produces (together, “the app”). By installing, opening or using the app you accept these Terms. If you do not accept them, do not use the app and uninstall it.

The Privacy Policy explains how the app handles data and forms part of these Terms. If we offer optional features under additional terms in the future, for example paid features, those terms will be shown to you before you accept them and will apply together with these Terms.

You must be old enough to enter into a binding contract where you live, or use the app with the consent and supervision of a parent or guardian who accepts these Terms for you. If you use the app for an organisation, you confirm that you may accept these Terms on its behalf; the consumer-protection provisions of these Terms apply only to consumers.

2What Ductivane provides

Ductivane is an offline art-practice desk for calligraphy: bundled Italic and brush-foundation exercises, reference playback, tracing and copying, a freehand canvas, local stroke comparisons and practice records, printable worksheets, artwork exports and manual backups. Interface languages do not imply that every writing system is taught.

Features, reference coverage and device support depend on the version you install. Descriptions of possible future scripts or pen tools do not make them available in the current version.

3Not professional advice; no safety-critical use

The app is a tool to help you plan and calculate. It does not give professional, engineering, legal or other expert advice, and using it does not create a professional relationship with us. You remain responsible for your inputs, for how you interpret the results and for what you decide to do.

Do not use the app as the only basis for a decision where an error could cause death, personal injury, damage to property or the environment, or legal or financial loss, and do not use it in a safety-critical system, in an emergency or to control equipment. Ductivane is an art-practice tool, not a medical, rehabilitation, diagnostic, biometric-identification or handwriting-authentication service. Feedback is not a qualification or proof of authorship. Constructed references and modelled pen behaviour are not recordings of a calligrapher's movements or a substitute for practice with physical tools.

4Licence to use the app

Subject to these Terms, we grant you a limited, personal, revocable, non-exclusive, non-transferable and non-sublicensable licence to download, install and use the app on Android devices you own or control, for your own purposes (personal practice, teaching and creating your own lettering work). The app is licensed to you, not sold.

Except where these Terms, an open-source licence or mandatory law allow it (for example decompiling for interoperability where the law permits), you may not: copy, modify, translate or create derivative works of the app; decompile, disassemble or reverse-engineer it; rent, lend, sell, sublicense, distribute or publish it, or make it available for use by others over a network; remove or change any copyright, trademark or legal notice; or get around any technical limit of the app, including any future purchase, licence or advertising mechanism.

Open-source components and fonts in the app are licensed under their own licences, listed in the app under About → Open-source licenses. Those licences prevail for those components, and nothing in these Terms limits the rights they give you.

5Practice feedback is an aid, not a certificate

Comparisons describe how your local strokes relate to a constructed reference and its guide settings. Shape, placement, slant, order, direction, spacing and pressure observations depend on correct inputs, supported hardware and the exercise. They are fallible practice cues, not a universal measure of artistic quality, a formal grade or a guarantee of improvement.

Reference geometry, timing and any reference pressure curves are constructed teaching models. Playback is not a recording of a human calligrapher. Different calligraphers and traditions may use valid alternative forms, sequences and rhythms. Check the underlying strokes and use a teacher’s judgement when appropriate.

The app does not identify a writer, verify a signature, diagnose handwriting or motor conditions, deliver rehabilitation or certify professional competence. Do not present an assessment or worksheet as medical advice, authenticated evidence or official certification.

6Stylus, pressure and physical tools

Pressure, tilt, hover, palm rejection and input prediction vary by Android version, device and pen. A finger or unsupported stylus does not acquire measured pressure through software. A direction model or uniform-width mode is a drawing aid, not evidence of pressure control with a physical brush.

Calibrate a supported pen for your device. Digital nib geometry, smoothing and ink appearance approximate tools and do not guarantee the same result on paper. Width is not a calibrated force measurement. Stop and rest if practice causes discomfort; the app gives no ergonomic or therapeutic advice.

7Worksheets, exports and print scale

Review the generated preview, supported characters, page size, margins and orientation before saving or printing. Exported artwork and PDF worksheets reflect the settings and content you select. Fonts, recipient apps, printer drivers and printer hardware can affect appearance, clipping and scale.

For physical practice guides, select actual size or 100% scaling where supported and measure the printed calibration rule. Do not assume fit-to-page printing preserves nib-size or x-height measurements. Test one page before a large print run or client delivery. Printed dimensions are not instrument-certified measurements.

Only supported backup formats and schema versions can be restored. A PDF or PNG is a presentation export and is not a full editable backup. Keep a full backup ZIP to move or preserve your original work.

8Your content and responsibilities

You are responsible for the text, artwork, notes and other material you enter, import, export, print or share, for having the necessary rights and permissions, and for reviewing anything you deliver to another person. Do not import or distribute third-party worksheets, font software, reference artwork or personal information without a lawful basis or permission where required.

Names and signatures may be personal information. Obtain appropriate permission before sharing another person’s material. Do not forge signatures, impersonate someone or use the app to produce fraudulent documents.

9Local data, backups and external services

Your saved app data stays on your device unless you choose to export, share or print it. There is no developer account, server copy or automatic cloud backup. Keep manual full backups in a location you trust, check that they can be opened and do not rely on the app as the sole copy of important artwork.

Imports may add records or replace existing data after confirmation. Review the preview carefully and save your current work first. Recovery and integrity checks cannot guarantee recovery from hardware failure, storage exhaustion, corruption or an incompatible archive. Clearing app storage or uninstalling removes private working data.

The system file picker may offer cloud providers; sharing passes a generated file to your chosen app; printing passes a document to your selected print service and printer. These providers can store or transmit your file under their own terms. Copies saved outside the app, sent to a recipient or printed are not removed by Delete all. See the Privacy Policy for details.

10Fonts and open-source components

The app bundles PT Sans and Didact Gothic under the SIL Open Font License 1.1, with licence and copyright notices available in the app. Its AndroidX components and PDFBox-based PDF implementation have their own open-source licences and notices; these are distinct from the licence for Zydeno’s app and reference artwork. Consult the bundled Licences screen and notices for the applicable terms.

Open-source licences prevail for the components they cover. These Terms do not grant permission to resell a font file, third-party library or another author’s worksheet contrary to its own licence. Android, Google Play and other third-party names identify their respective services; their use does not imply endorsement or affiliation.

11Acceptable use

Use the app lawfully and considerately. Do not use it to infringe copyright or privacy, forge signatures or mislead clients, students or recipients about the source, authorship or reliability of an export. You remain responsible for any instruction, service or artwork you provide to others.

12Your artwork and our materials

You retain the rights you hold in your original artwork, handwriting, notes and custom text. Creating or exporting work in Ductivane does not transfer ownership of that work to Zydeno.

The app, brand, bundled lessons, constructed reference paths and original interface artwork are protected by intellectual-property law. You may practise with the supplied exercises and print the worksheets the app generates for your own practice or teaching. This does not grant a right to extract and redistribute the reference library, republish the lessons as your own course or claim ownership of bundled examples. Third-party rights and licences remain applicable.

13Price, payments, ads and future paid features

Current version. The current version of Ductivane is provided free of charge, without ads and without in-app purchases or subscriptions. This describes the current version only. It is not a promise that the app, or any feature of it, will remain free of charge or free of ads.

Possible changes. We may at any time introduce advertising; offer paid features, in-app purchases, subscriptions or a paid edition; change which features are free; and set or change prices. Features that are free today may require payment in a future version. We will describe such changes in the store listing and release notes, and in the Privacy Policy where they affect data.

Purchases. Any purchase will be made through Google Play and processed by Google under the Google Play Terms of Service and its payment policies. Prices are shown in Google Play before you buy, including taxes where applicable. Subscriptions renew automatically until you cancel them in Google Play; cancelling stops future renewals. Refunds follow Google Play’s refund policies and your mandatory consumer rights, such as the right of withdrawal in the EU and the UK. Where you ask for immediate access to digital content during a withdrawal period, you may lose that right to the extent the law allows, and you will be asked to confirm this before you buy. You are charged only if you choose to buy something.

Ads. If the app shows ads, they are supplied by third parties. We are not responsible for the content of ads or for the products and services advertised, and any dealings with advertisers are between you and them.

Price changes. We may change prices for future purchases at any time. For an active subscription, we will announce a price increase as Google Play and the law require, and you can cancel before it applies.

14Disclaimer of warranties

Calligraphy feedback, constructed references, simulated nib behaviour, recovery tools and printable layouts can contain errors. We do not promise artistic improvement, accurate pressure readings on every device, compatibility with every pen or printer, uninterrupted saving or recovery of lost work.

15Limitation of liability

To the extent the law permits, we are not responsible for loss or corruption of artwork, strokes, practice records or backups; disclosure through a destination you select; wasted paper, ink or materials; incorrect print scale; rejected client work; or losses arising from reliance on local practice feedback or constructed references. The limitations and mandatory exceptions below govern this clause.

16Your rights as a consumer

If you use the app as a consumer, you benefit from the mandatory consumer-protection rules of the country where you live, and nothing in these Terms affects them. In particular:

• EU and EEA: your statutory rights, including those on the conformity of digital content and digital services under the national rules implementing Directive (EU) 2019/770 where they apply, and mandatory product-liability rules, remain unaffected.
• United Kingdom: your statutory rights, including under the Consumer Rights Act 2015, remain unaffected.
• Australia: our services come with guarantees that cannot be excluded under the Australian Consumer Law. Where the law allows us to limit our liability for failing to meet a consumer guarantee for services that are not of a kind ordinarily acquired for personal, domestic or household use, our liability is limited to supplying the services again or paying the cost of having them supplied again.
• New Zealand: if you acquire the app for business purposes, you agree that the Consumer Guarantees Act 1993 does not apply, to the extent the law permits.
• United States and Canada: some states and provinces do not allow the exclusion of implied warranties or the limitation of incidental or consequential damages, so some of the exclusions above may not apply to you. In Québec, the mandatory provisions of the Consumer Protection Act apply.

17Indemnity

To the extent permitted by law, you agree to indemnify and hold harmless the developer against claims, liabilities, damages, losses and reasonable costs, including reasonable legal fees, brought by third parties and arising out of (a) the artwork, handwriting, names, notes, worksheets and other content you import, create, print, export or share, including work you supply to clients and content about other people, (b) your breach of these Terms, (c) your violation of any law or of the rights of others, or (d) output of the app that you provide to another person, such as a client or employer. This does not apply to the extent a claim is caused by our own breach of these Terms or our negligence, or where local consumer law does not allow it.

18Changes, availability and termination

To the extent the law allows, we may change, update, add or remove features, change data sources, and suspend or discontinue the app, in whole or in part or in any country, at any time. We are not obliged to provide updates, maintenance or support, except where mandatory consumer law requires updates to keep the app in conformity.

You may stop using the app at any time by uninstalling it. Your licence ends automatically if you materially breach these Terms, and we may end or suspend it where the law requires. When it ends, you must stop using the app and uninstall it. Your data stays on your device under your control, so export what you need first.

Provisions that by their nature should continue after these Terms end continue to apply, including those on intellectual property, disclaimers, limitation of liability, indemnity, governing law and general provisions.

19Google Play

You obtain the app through Google Play. Your download, and any purchase you make, is also governed by the Google Play Terms of Service and Google’s policies. Where these Terms conflict with Google Play’s terms on the distribution, billing, refunds or licensing of apps obtained from Google Play, Google Play’s terms prevail to the extent of that conflict.

These Terms are between you and the developer only, not Google. Google is not responsible for the app or its content and has no obligation to provide maintenance or support for it. Android and Google Play are trademarks of Google LLC.

20Governing law and disputes

These Terms, and any dispute or claim arising out of or in connection with them or the app, including non-contractual disputes, are governed by the law of the country in which the developer is established, without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

The courts competent for the place where the developer is established have jurisdiction. If you are a consumer, you keep the protection of the mandatory provisions of the law of your country of residence, and you may bring proceedings in the courts of that country where that law allows it.

Before starting formal proceedings, please write to [email protected] and give us at least 30 days to try to resolve the issue informally. This does not affect any time limit that applies to you by law or your right to use an alternative dispute-resolution body available to consumers in your country.

21General provisions

• Entire agreement. These Terms, the Privacy Policy and any additional terms you accept for optional features are the entire agreement between you and us about the app.
• Severability. If a provision is found invalid or unenforceable, it applies to the maximum extent permitted and the rest remains in effect.
• No waiver. Not enforcing a provision is not a waiver of the right to enforce it later.
• Assignment. You may not transfer your rights or obligations under these Terms. We may transfer ours, for example together with the app to another developer; where the law requires, this will not reduce your rights as a consumer.
• Events beyond our control. We are not responsible for failure or delay caused by events beyond our reasonable control, such as outages of networks, devices or third-party services, natural disasters or acts of authorities.
• Export and sanctions. You agree to use the app in compliance with applicable export-control and sanctions laws.
• No third-party rights. No one other than you and us may enforce these Terms.
• Notices. We may give notices in the app, in its store listing or release notes, or on this page. You can send notices to [email protected].
• Language. These Terms are written in English, which is the binding version. A translation, if offered, is for convenience only, unless the law of your country requires otherwise.

22Changes to these terms

We may update these Terms, for example when we change the app, introduce ads or paid features (§13), or when the law changes. The effective date and version at the top of this page show which version applies, and the version history (§23) summarises the changes.

For material changes we give reasonable notice before they take effect, for example in the release notes or in the app. If you keep using the app after the changes take effect, you accept the updated Terms; if you do not agree, stop using the app and uninstall it. Changes do not apply to disputes that arose before they took effect.

23Version history

24Contact

• Developer: Zydeno, the developer of Ductivane on Google Play
• E-mail: [email protected]
• Website: zydeno.com

See also the Privacy Policy.