MD Engine - EULA
Last updated: 10 August 2026
1. Purpose, parties and acceptance
This End User License Agreement (the "EULA") governs the terms of use of the "MD Engine" software and the asset packs offered by Ratalaika Games, S.L. (Spanish tax ID (NIF) B-24.650.483, registered office at C/ Capellán, 53, Villarrodrigo de las Regueras, 24197 León, Spain; the "Licensor"). It constitutes a binding agreement between the Licensor and the natural or legal person who downloads, installs, activates or uses the Software (the "Licensee").
By ticking the acceptance box or downloading, installing or activating the Software, the Licensee declares that they have read and accepted this EULA in its entirety. If the Licensee does not agree, they must not download, install or use the Software, and may exercise, where applicable, the rights provided for in the General Terms and Conditions of Contract.
2. Definitions
- Software: the "MD Engine" computer program, its object code, its documentation and the associated materials.
- Documentation: the manuals, guides and instructions provided by the Licensor.
- Device: each device on which the Software is installed and activated.
- Activation / Reactivation: the procedure for enabling the Software on a Device and, respectively, the procedure for releasing and re-enabling activations.
- Assets: the digital resource packs (images, audio, animations or others) offered by the Licensor.
- Educational license: the license type intended for teachers and educational institutions described in clause 4.2.
3. Grant of license
The Licensor grants the Licensee a non-exclusive license of use, non-transferable except where a mandatory legal provision provides otherwise, worldwide in scope and terminable in the event of breach in accordance with this EULA, to install and use the Software in accordance with this EULA and the Documentation. The Software is licensed, not sold: ownership of the Software or its copies is not transferred; only the right to use it on the terms agreed herein is granted.
4. License types
4.1. Standard license
The standard license allows up to three (3) simultaneous activations. The Licensee may reset activations from their user profile, for example after formatting or replacing a Device, within the reasonable technical limits established to prevent fraud, unauthorized sharing or abuse of the activation system. The Software may require periodic verification of the license via an internet connection at least once every ninety (90) days; each verification carried out renews that period. Any other technical limits will be notified in the user account, documentation or applicable interface. The standard license shall be of indefinite duration, save for termination in accordance with this EULA.
4.2. Educational license
Intended for teachers or educational institutions, at a reduced price. It allows two (2) activations, has a term of one (1) year (designed for a single school year), after which it ceases to function, and authorizes use exclusively for educational and learning purposes, with no commercial use. The purchaser is always the teacher or the institution; this license does not authorize the processing of students' personal data by the Licensor. The educational license does not allow selling, monetizing, licensing, commercially exploiting or distributing for commercial purposes the games, tools, content or results created under such license. It does allow teaching, academic, learning, assessment, non-commercial portfolio and educational demonstration use, unless the product listing states otherwise. It also allows the free publication of the projects created (for example, on platforms such as itch.io), their dissemination in video and participation in game jams, including sponsored ones, provided that the project is not monetized directly or through a publisher; in order to commercially exploit a project created under this type, a standard license must be purchased. Commercial use of this license type constitutes a serious breach (clause 14).
4.3. Acquisition through Steam
Where the Software is acquired through Steam, its installation, activation and use shall additionally be governed by the Steam/Valve terms, which the Licensee accepts with that platform; in the event of any conflict regarding technical management on Steam, the platform's terms shall prevail, without prejudice to the mandatory rights of the consumer. Acquisition of the Software through the website does not include a Steam key; access is provided through the activation system described in clause 4.1.
5. Activation and Software data
The activation system verifies the validity of the license, the number of authorized Devices and legitimate use of the Software. To this end, technical data may be processed, such as a technical Device identifier generated as an irreversible fingerprint (hash) derived from hardware identifiers, which does not on its own allow the device to be identified, the number of available and used activations, the date and time of activation and the technical logs generated by the system, to the extent strictly necessary to verify the license, prevent abuse and provide support. The processing of personal data arising from activation is governed by the Privacy Policy. The Licensee undertakes not to manipulate, circumvent, disable or interfere with the activation system.
6. Use restrictions
Except with the Licensor's express written authorization or where an applicable mandatory rule provides otherwise, the Licensee may not:
- Resell, sublicense, rent, lend, assign, distribute or make available to third parties the Software or its activation keys;
- Copy the Software beyond what is necessary for its normal use and the legally permitted backup copy;
- Remove, alter or conceal intellectual property notices, trademarks or license legends;
- Use the educational license for commercial purposes;
- Circumvent, disable or interfere with the technical protection measures or the activation system;
- Decompile, disassemble or reverse engineer the Software, except in the cases legally permitted to achieve interoperability;
- Use the Software for unlawful purposes or in a manner contrary to this EULA or the Documentation.
7. Intellectual property and reservation of rights
The Software is a computer program protected by intellectual property law (the Consolidated Text of the Spanish Intellectual Property Act (Texto Refundido de la Ley de Propiedad Intelectual) and Directive 2009/24/EC). The Licensor (or its licensors) retains ownership of all rights in the Software, its source and object code, its structure, its documentation and its distinctive signs. All rights not expressly granted in this EULA are reserved to the Licensor.
8. Content created by the Licensee
The video games and works that the Licensee creates with the Software are owned by the Licensee, without prejudice to the Licensor's rights in the engine itself. The Licensee is solely responsible for the content they incorporate into their creations and for obtaining any applicable third-party authorizations. The use of console names or third-party trademarks to indicate compatibility must comply with the lawful descriptive use of the third-party trademark.
Except in the case of educational or non-commercial licenses, the Licensee may commercially exploit the video games and works created with the Software. Where technically necessary, this license includes the right to reproduce and distribute, solely as integrated into the Licensee's final game or work, the runtime components, libraries, templates, object code or Software materials necessary for the execution of the created project, provided that they are not distributed in a separate, extractable or reusable form as a substitute for the Software.
9. Asset packs
The Assets are licensed for incorporation into the Licensee's own projects, including video games, prototypes, audiovisual materials or other interactive content, in accordance with the license type acquired. Unless the product listing states otherwise, the standard license permits their use in commercial and non-commercial projects.
The Licensee may modify the Assets and integrate them into their own projects, but may not resell, sublicense, redistribute, publish, share or make them available to third parties as standalone, raw, editable or extractable files, or as part of a collection, library, asset pack, template or substantially equivalent product.
10. Third-party components and free software
Where the Software incorporates third-party libraries, components, tools or materials, including free or open source software components, such components shall be governed by their respective licenses. In such case, the Licensor shall identify the applicable components and licenses in the Documentation, legal notices, license files, the Software's credits screen or materials associated with the Software.
11. Updates, support and end of life
The Licensor may offer updates, fixes, improvements or support for the Software in accordance with the policy in force at any given time. Unless expressly agreed, support does not include bespoke development, adaptation to the Licensee's specific projects, or assistance regarding third-party hardware, tools or services. The updates necessary to keep the digital content in conformity shall be supplied for the period legally required or reasonably expected under the applicable regulations. The Licensor may discontinue versions, functionalities or ancillary services, giving reasonable notice where possible, without prejudice to the mandatory rights of the consumer.
12. Legal warranty and exclusion of additional warranties
As digital content, the Software is subject to the legal conformity regime provided for in consumer regulations and in the General Terms and Conditions of Contract where the Licensee acts as a consumer. Without prejudice to the mandatory legal warranties, the Licensor does not warrant that the Software will operate uninterruptedly or free of errors in all environments, nor that it is fit for particular purposes other than those described in the Documentation or not communicated to and expressly accepted by the Licensor.
13. Limitation of liability
The Licensor's liability is subject to the legal limits. Liability that the law does not permit to be excluded vis-à-vis consumers is neither excluded nor limited (in particular, for willful misconduct, personal injury or the legal warranties). To the extent permitted by law, the Licensor shall not be liable for indirect damages, loss of profit or loss of data arising from the use of or inability to use the Software, and the Licensee must keep backup copies of their projects.
14. Term, refunds and termination
The license shall have the duration indicated for each type. The return, valid withdrawal, termination or refund of the product shall entail the cancellation of the associated licenses, such that the activated versions will cease to function. The Licensor may terminate the license, upon prior notice to the Licensee, in the event of a serious breach of this EULA. Where the breach is remediable, the Licensor may grant a reasonable period for its remedy. It may be terminated immediately in the event of circumvention of the activation system, unauthorized redistribution, unlawful assignment of keys, commercial use of an educational license or serious infringement of intellectual property rights. Upon termination of the EULA, the Licensee must cease use and uninstall the Software; those clauses which by their nature are intended to survive shall remain in force.
15. Data protection
The processing of the Licensee's personal data is governed by the Licensor's Privacy Policy, available on the website.
16. Assignment, force majeure and integrity
The Licensee may not assign this EULA without the Licensor's consent; the Licensor may assign it within its group or in the context of a corporate transaction, without impairment of the Licensee's rights. Neither party shall be liable for breaches due to force majeure. If any clause is declared void, the remaining clauses shall retain their validity. This EULA, together with the General Terms and Conditions of Contract and the Privacy Policy, constitutes the entire agreement on its subject matter.
17. Governing law, language and jurisdiction
This EULA is governed by Spanish law, without prejudice to the mandatory consumer and user protection rules that may be applicable. In the event of a discrepancy between language versions, the Spanish version shall prevail, unless the applicable regulations require another solution. Where the Licensee has the status of a consumer or user, any dispute shall be submitted to the courts and tribunals that are competent in accordance with the applicable regulations. Where the Licensee acts as a business or professional, and provided that the applicable regulations so permit, the parties expressly submit to the Courts and Tribunals of Málaga, waiving any other jurisdiction that may correspond to them.