End User License Agreement

1Definitions

“Licensor”, “we”, “us” — Aleksey Petrushenko, a natural person registered as self-employed in the Russian Federation and paying professional income tax (TIN 550901130219), trading under the name Conceptual Games; the owner and licensor of the Software.

“Software” — the LLM Cheburnexus IDE extensions and plugins, the analysis engine and MCP server components they install, and any documentation and updates supplied with them.

“You” — the individual accepting this Agreement, or, where you accept it on behalf of an organisation, that organisation. If you accept on behalf of an organisation you confirm you are authorised to bind it.

“Plan” — the tier of use you hold: Free, Pro, ProMax, or any other tier we publish from time to time, together with its published limits.

“Plugin User” — one natural person authorised to use the Software under a Plan.

2Licence grant

2.1. We grant you a limited, worldwide, non-exclusive, non-transferable, non-sublicensable licence to install and use the Software, including generally available updates released during your period of rightful use, in accordance with this Agreement, the Documentation, and the limits of your Plan.

2.2. The licence is granted per Plugin User. One Plugin User may install the Software on any number of machines that person personally uses. You must ensure the number of Plugin Users does not exceed the number for which you hold a Plan.

2.3. For a paid Plan the licence runs for your subscription period. When the subscription period ends without renewal the Software continues to operate at Free-Plan limits unless we state otherwise in your purchase confirmation. No perpetual fallback licence to paid functionality is granted.

2.4. The Free Plan is granted for an indefinite term at the published Free limits and may be used for commercial work. We may change Free limits for future versions.

2.5. This is a grant of rights to use, not a sale or transfer of title. You may not transfer, assign, resell, rent, lease, or share your licence or licence key without our prior written consent.

3Restrictions

You may not:

• copy, modify, translate, or create derivative works of the Software, except as this Agreement permits;
• reverse engineer, decompile, or disassemble the Software, or attempt to derive its source code — except, and only to the extent, that such acts cannot lawfully be prohibited under applicable law (including where they are permitted for interoperability purposes under Article 6 of Directive 2009/24/EC or an equivalent national provision);
• circumvent, disable, or interfere with licensing, entitlement, quota, or usage-accounting mechanisms, or use the Software beyond the limits of your Plan;
• use information obtained from the Software about its internal design to build a competing product;
• sublicense, host, or make the Software available to third parties as part of your own commercial product or service, or use it to provide a service bureau, SaaS, or managed offering, without a separate written agreement with us;
• remove or obscure any copyright, trademark, or other proprietary notice.

4Engine component, downloads and updates

4.1. On first activation the Software downloads its analysis engine (a native executable, approximately 250 MB) over HTTPS from our public release repository and verifies it against a fixed SHA-256 checksum before use. This download is one-way: no project data is transmitted as part of it.

4.2. Your use of the downloaded engine is governed by this Agreement. Updates and upgrades are provided at our discretion on an “as available” basis; we do not undertake to release any particular update.

4.3. The Software requires third-party software (an IDE, and, for MCP features, an AI assistant or agent) that we neither supply nor control. Your use of that software is governed by its own terms.

5Third-party and open-source components

5.1. The Software includes third-party components, including open-source components, which are licensed to you under their own licence terms. Those terms prevail over this Agreement to the extent of any conflict, and nothing in this Agreement limits any right you have under an open-source licence.

5.2. The applicable notices and licence texts are distributed with the Software and are available on request at [email protected].

6Licence keys and entitlement

6.1. Paid entitlement is evidenced by a signed licence file (claims.json) placed on your machine, or by a key you enter, which is stored in your operating system's or IDE's secure credential store. The Software does not contact a remote server to validate your licence.

6.2. The Software records local usage counters solely to apply your Plan's limits. Enforcement of limits may be partial in a given version; the absence of technical enforcement is not permission to exceed your Plan.

6.3. You are responsible for keeping your licence file and keys confidential. Publishing or sharing them is a material breach of this Agreement.

7Your code and your data

7.1. Analysis runs locally on your machine. Your source code and analysis results are not transmitted to us and do not leave your machine through the Software. The Software contains no telemetry.

7.2. You retain all rights in your code. We acquire no licence or interest in it.

7.3. Our handling of any data is described in the Privacy Policy, which forms part of this Agreement.

7.4. Where you use the Software together with an AI assistant, that assistant may transmit data it retrieves to its own operator. That transmission is outside the Software and is governed by that operator's terms and privacy policy, not by this Agreement.

8Ownership

All rights, title, and interest in the Software — including its source code, algorithms, models, trademarks, and documentation — remain with us and our licensors. Except for the licence expressly granted in section 2, no rights are granted to you, whether by implication, estoppel, or otherwise.

9Fees, purchasing and refunds

9.1. Where you purchase a paid Plan through a marketplace, that marketplace is the merchant of record and its order, billing, and refund terms apply to the transaction.

9.2. Where you purchase directly from us, the terms published on our site at the time of purchase apply. For purchases within the Russian Federation those terms are set out in the offer agreement.

9.3. Prices and Plan contents may change. Changes do not affect a subscription period already paid for.

10Term and termination

10.1. This Agreement takes effect when you first install or use the Software and continues until terminated.

10.2. You may terminate at any time by ceasing all use and uninstalling the Software.

10.3. We may terminate the licence if you materially breach this Agreement — in particular section 3 or 6 — where the breach is not remedied within 14 days of our notice to the contact address you provided. We may terminate immediately where the breach is incapable of remedy.

10.4. On termination you must cease using and uninstall the Software. Sections 5, 7, 8, and 11 to 14 survive termination.

11Disclaimer of warranties

11.1. THE SOFTWARE IS PROVIDED “AS IS” AND “AS AVAILABLE”, WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, OR NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SOFTWARE OR ITS OUTPUT IS ACCURATE, COMPLETE, OR CORRECT; THAT IT MEETS YOUR REQUIREMENTS; THAT IT WILL BE UNINTERRUPTED, SECURE, OR ERROR-FREE; OR THAT DEFECTS WILL BE CORRECTED.

11.2. THE SOFTWARE IS A DEVELOPER AID. ITS OUTPUT MUST NOT BE RELIED ON AS THE SOLE BASIS FOR ANY DECISION AFFECTING PRODUCTION SYSTEMS, SAFETY, SECURITY, OR LEGAL COMPLIANCE. YOU REMAIN RESPONSIBLE FOR REVIEWING ANY CHANGE MADE TO YOUR CODE.

12Limitation of liability

12.1. TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, WE WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, REVENUE, DATA, CODE, GOODWILL, OR BUSINESS, ARISING OUT OF OR RELATING TO THE SOFTWARE OR THIS AGREEMENT, WHETHER IN CONTRACT, TORT, OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

12.2. OUR TOTAL AGGREGATE LIABILITY ARISING OUT OF OR RELATING TO THE SOFTWARE OR THIS AGREEMENT WILL NOT EXCEED THE GREATER OF (A) THE AMOUNT YOU PAID FOR THE SOFTWARE IN THE SIX MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM AND (B) USD 100.

12.3. Nothing in this Agreement excludes or limits liability that cannot lawfully be excluded or limited, including liability for death or personal injury caused by negligence, for fraud, or for fraudulent misrepresentation.

13Consumers

13.1. If you use the Software as a consumer, you retain all mandatory statutory rights under the law of your country of residence, and nothing in this Agreement — in particular sections 11, 12, and 14 — limits those rights.

13.2. Where a marketplace grants you a statutory or contractual right of withdrawal or refund, you exercise it through that marketplace.

14Governing law and disputes

14.1. This Agreement is governed by the law of the Russian Federation, excluding its conflict-of-laws rules and the United Nations Convention on Contracts for the International Sale of Goods.

14.2. Disputes will be submitted to the competent courts at the Licensor's place of residence in the Russian Federation.

14.3. Sections 14.1 and 14.2 do not deprive a consumer of the protection of the mandatory law of, or of the right to bring proceedings in, that consumer's country of residence.

15Compliance with trade laws

You must not use, export, or re-export the Software in violation of any applicable export control or sanctions law, and you confirm you are not a person with whom dealings are prohibited under such law.

16Changes to this Agreement

16.1. We may publish a revised version of this Agreement at cheburnexus.tech/license/. The revised version applies to versions of the Software you install after it takes effect.

16.2. A revision does not apply retroactively to a subscription period already paid for where it materially reduces your rights. If you do not accept a revision, stop using the Software.

17General

17.1. This Agreement, together with the Privacy Policy and your purchase confirmation, is the entire agreement between us on its subject matter.

17.2. If any provision is held unenforceable, the remainder stays in force and the provision is applied to the maximum extent permitted.

17.3. Our failure to enforce a provision is not a waiver of it.

17.4. We may assign this Agreement in connection with a merger, acquisition, or sale of assets; you may not assign it without our written consent.

17.5. This Agreement is concluded in English. Where we publish a translation and the versions conflict, the English version prevails.