Terms of Use

01 Agreement and publisher

These Terms supplement the applicable software licence for History of Bulgaria, published by Andrii Matiushev, trading as Zydeno. By installing or using the app you accept these Terms and Privacy Policy. If you disagree, stop using and remove the app. If you cannot legally accept them independently, a parent or guardian must agree on your behalf. A person acting for an organisation must have authority to bind it.

02 Purpose and historical accuracy

History of Bulgaria offers 59 illustrated audio stories with cited sources and interactive questions, a guide to historical people and rulers, On This Day, a Find of the day on the home screen, a personal collection of finds, and offline maps and historical place context. It supports iPhone and iPad. Reading, narration and questions use bundled content. The app is free, with no ads, in-app purchases, subscriptions or accounts.

It is an independent history app for personal reading and listening. It is not an official teaching platform or an institutional endorsement. Historical texts are based on cited sources, but dates, interpretations, translations and synthetic pronunciation can contain errors. Inclusion does not imply expert review: source checking and expert review are different, and draft content is not expert-reviewed. Reconstructions and artistic illustrations are not archival evidence. Maps illustrate places and historical context; they are not navigation aids or proof of historical borders. Check the sources and report errors through Report an error or [email protected].

03 Licence and acceptable use

The app is licensed for use under the software licence applicable to its App Store distribution. Where no custom licence is supplied, Apple Standard EULA applies. These Terms supplement that licence and do not remove rights granted by mandatory law or an applicable open licence. Do not use the app unlawfully, infringe others’ rights, remove required attribution or redistribute proprietary material without permission. Open licences govern the materials they cover. You retain your rights in personal material you choose to send us; voluntary suggestions may be used to improve the app.

04 Local data and external services

Progress, saved-story identifiers, question responses and settings stay on your device. There is no account, publisher server copy or automatic cloud synchronisation. In Settings you can export your progress to a file, import it, or delete all local data. Deleting the app also removes its local storage; offloading may retain it. We cannot recover lost progress. Privacy Policy explains local storage, voluntary support email and Apple diagnostic sharing.

External source and licence sites open only by your action. Their operators and your email provider are responsible for their own services and policies. We do not control their accuracy, security or availability.

05 Intellectual property

The app’s own historical texts are © Zydeno. App code, design and branding belong to their respective rights holders. A citation does not grant permission to republish its source. Third-party images and other open materials retain their own licences and attribution requirements; these Terms do not remove rights granted by those licences. Names of institutions are used for identification and imply no affiliation.

06 Price and future versions

The current app is free, with no advertising, in-app purchases or subscriptions. These Terms create no payment obligation. This describes the current version and is not a promise about future pricing. Material changes require clear disclosures and compliance with applicable law and App Store rules.

07 Warranty and responsibility

To the extent permitted by law, the app and its content are provided as is and as available. We do not promise complete or error-free historical coverage, perfect synthetic pronunciation, uninterrupted availability, compatibility with every future system version or preservation of local progress. Mandatory warranties and consumer remedies remain unaffected.

08 Limits of liability and consumer rights

To the maximum extent permitted by law, we are not liable for indirect or consequential loss, lost profits, lost progress, data corruption or losses arising from reliance on historical content or external services. Our total aggregate liability is limited to the greater of the amount paid to us for the app in the preceding 12 months and EUR 50, whatever the legal basis of the claim.

These exclusions and cap do not apply to death or personal injury caused by negligence, fraud, intentional misconduct, gross negligence, mandatory product liability or anything that cannot lawfully be limited. Mandatory consumer protections, including EU/UK digital-content rights and applicable Australian, New Zealand, Canadian and other local guarantees, prevail. Where a limitation is unlawful, it applies only to the extent permitted.

Where law permits, you indemnify the publisher for third-party claims caused by your unlawful misuse or infringement of rights, excluding our own fault. This does not apply where consumer law prohibits it.

09 Changes, availability and termination

We may update, change or discontinue features subject to mandatory law and reasonable notice where required. You may stop using and delete the app at any time. A material breach may end your licence as provided by the applicable software licence. Provisions intended to continue after use ends, including intellectual-property and dispute provisions, remain effective.

10 Apple-specific terms

The software licence presented in the App Store applies; where no custom EULA is provided, Apple Standard EULA applies. These web Terms supplement it and do not replace it. Apple Media Services terms also apply. Apple is not the publisher of this independent app and is not responsible for its content or support. Direct app questions to Zydeno. Mandatory rights and the applicable Apple licence take precedence where required.

11 Governing law and disputes

Talk to us first. Most problems are misunderstandings or content mistakes, and it is quicker to fix them than to argue about them. Please write to [email protected] and give us 30 days to try to resolve the matter informally before you start formal proceedings.

Law. These Terms, and any dispute arising from them or from your use of the app, are governed by the laws of the Republic of Bulgaria. This excludes Bulgaria’s conflict-of-laws rules and the United Nations Convention on Contracts for the International Sale of Goods. If you are a consumer, this choice of law does not deprive you of the protection of the mandatory provisions of the law of the country where you normally live.

Courts. The courts of Sofia, Bulgaria, have jurisdiction. If you are a consumer, however, you may also bring proceedings in the courts of your own country of residence. We may only bring proceedings against a consumer in the courts of their country of residence.

Alternative dispute resolution. Consumers in the EU may use an out-of-court dispute-resolution body in their country. In Bulgaria, these are the conciliation committees at the Commission for Consumer Protection (kzp.bg). The EU’s Online Dispute Resolution platform closed in July 2025. We are not obliged to take part in alternative dispute resolution, but we will consider it in good faith.

Individual claims. To the extent permitted by applicable law, any claim must be brought in your individual capacity, not as a plaintiff or class member in any class, collective or representative action. It must also be brought within one year after the cause of action arose, unless a longer period is required by law. This paragraph does not apply where local consumer law prohibits it.

12 General provisions and changes

These Terms and the applicable software licence govern their subject matter. If a provision is invalid, the remainder continues where legally possible. Failure to enforce a right is not a waiver. No transfer may reduce mandatory consumer rights. Comply with applicable export and sanctions laws. Rights under the applicable Apple licence remain unaffected. These pages are provided in English.

Changes will be published with an updated date and any notice required by law. Changes do not apply retroactively. Version 1.0, prepared for release on 5 November 2026. This preparation date does not announce App Store availability. Questions: [email protected].

13 Content and licences

Images and other materials retain the authorship, sources and individual licences identified in the app’s About and licences screen and story credits. Image terms include public-domain status, CC0, CC BY and CC BY-SA, as specified per asset. A source citation is not permission to republish its material. Cormorant Garamond, Manrope and Merriweather use SIL Open Font License 1.1; the app also includes derived fonts with accompanying notices. These web pages bundle Cormorant Garamond and Manrope with their OFL notices. Natural Earth base-map data is public domain: Natural Earth. Base-map geography does not establish historical borders. Synthetic narration is generated before distribution and bundled as audio; no voice model or speech-generation service runs in the app.

Bundled narration voices and recorded dataset licences

• bg_BG-dimitar-medium — CC0
• en_US-ljspeech-high — Public domain
• ru_RU-dmitri-medium — CC0
• uk_UA-ukrainian_tts-medium, speaker 0 — CC0
• de_DE-thorsten-high — CC0
• el_GR-rapunzelina-low — CC0
• pl_PL-gosia-medium — CC0
• ro_RO-mihai-medium — CC0
• tr_TR-fettah-medium — CC0

The entries below reproduce the dataset licences recorded in the app’s bundled voice credits. They identify training-data sources, not a blanket licence for every use of the audio or the app. Narration is synthetic, not an archival recording or a human historian’s endorsement. Ukrainian narration uses speaker 0.

Manrope · OFL 1.1 · Cormorant Garamond · OFL 1.1