Numerus End User License Agreement

Version: 1.0 of 12 November 2026

This is an English translation of the Numerus End User License Agreement. The Agreement is governed by the laws of the Russian Federation; if this translation and the Russian version (EULA.md) differ, the Russian version prevails.

This agreement (the "Agreement") is made between Elena Nikolaevna Frolova, an individual (the "Rights Holder"), and the person or organization that has purchased a license for Numerus (the "Licensee"). By installing, copying or using the Software, the Licensee accepts the terms of this Agreement. If the Licensee does not agree to them, the Licensee may not use the Software.

1. Definitions

Software - the Numerus archiver: executable files, libraries, source code (if provided), documentation and updates provided to the Licensee.
License - the type of license from section 3 purchased by the Licensee, as stated in the invoice or purchase confirmation.
User - an individual whom the Licensee allows to work with the Software.
Device - a computer, server, virtual machine or container where the Software is installed or run.

2. Grant of License

2.1. The Rights Holder grants the Licensee a non-exclusive, non-transferable license, without the right to sublicense, to use the Software within the purchased License for its term.

2.2. The License is confirmed by a license file that the Rights Holder issues after payment. The license file is for the Licensee only: it may not be transferred or published, and its verification may not be circumvented.

2.3. Trial period. Without a license file, the Software works in full for 14 days from the first compression on a Device, for evaluation. After that, without a license file the Software only decompresses archives. Extending the trial period by deleting service files or by any other means is prohibited.

2.4. Update check. The application with the progress window (on macOS, Windows and Linux) asks the Rights Holder's website for the latest version number no more than once a day and offers to open the download page if a new version is available. The contents of files, the Licensee's data and license details are not sent; the website receives only the technical data of the request (IP address, version of the Software). Automatic checking can be turned off in the application menu. The command line tool (numerus) never goes online; the license is checked offline.

2.5. The Software is licensed, not sold. All rights to the Software, including the archive format, algorithms, source code and the Numerus trademark, remain with the Rights Holder. All rights not expressly granted by this Agreement are reserved by the Rights Holder.

3. License Types

Type	Who uses it	Devices	Term
Personal	1 User	up to 3 Devices of that User	perpetual
Team	up to 10 Users of one organization	Devices of those Users	perpetual
Site	all employees of one organization	Devices of the organization	perpetual

One-time payment. A License of any type is paid once and is perpetual.
Updates. The License includes versions of the Software released within 12 months after payment. The Licensee may use those versions forever, also after the update period ends. The Rights Holder is not obliged to release updates.
Update renewal is optional: another 12 months for 50% of the current price of a License of the same type. Renewed updates start the day after the previous period ends, or on the payment day if the renewal is paid later.
Upgrades. To add Users or move to another License type, the Licensee buys a new License; the amount paid earlier may be credited by agreement of the parties.
Embedding in products. Including the Software or its parts in products and services that are distributed or provided to third parties (OEM, SDK, SaaS) is allowed only under a separate written agreement with the Rights Holder.

4. Restrictions

Unless expressly permitted by this Agreement or by law, the Licensee may not:

sell, rent, transfer, sublicense or otherwise provide the Software to third parties;
use the Software beyond the number of Users or Devices paid for under the License;
decompile, disassemble or otherwise reconstruct the source code of the Software, or create derivative products based on it;
circumvent, disable or modify the licensing mechanisms and keys;
remove or alter copyright and license notices;
use the Software to create a competing archiver or compression format;
publish results of comparative tests of the Software without stating the version of the Software and the test conditions.

Archives created with the Software and the Licensee's data belong to the Licensee. The Licensee may decompress its archives after the License term ends, using the latest version received.

5. Third-Party Components

The Software includes open source components. They are distributed under their own licenses, listed in THIRD_PARTY_LICENSES.txt. This Agreement does not limit the Licensee's rights under those licenses.

6. Payment

6.1. How to buy. The Licensee sends a request to i@pfrolov.ru, stating the License type and the name of the Licensee. The Rights Holder issues an invoice with the price and payment details. Paying the invoice means accepting this Agreement.

6.2. The License takes effect after payment. The license file is sent to the Licensee's email address within 2 business days after the payment is received. The Rights Holder issues a payment document (receipt) where the law requires it.

6.3. Refunds. The Licensee may cancel the License and receive a full refund within 7 calendar days after payment by writing to i@pfrolov.ru. After a refund, the License ends and the Licensee must delete the license file. Refunds for update renewals and for a repeat purchase after a refund are by agreement of the parties. This clause does not limit the rights of a consumer Licensee provided by law.

7. Disclaimer of Warranties

7.1. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT, TO THE EXTENT PERMITTED BY LAW.

7.2. The Rights Holder does not warrant that the Software will compress any data or reach a particular compression ratio, that it will work without errors, or that archives will be compatible with future versions, unless the documentation expressly says so.

7.3. The Licensee is responsible for its own backups. Before deleting source data, the Licensee must make sure that the archive decompresses successfully.

8. Limitation of Liability

8.1. TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE RIGHTS HOLDER IS NOT LIABLE FOR INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF DATA, PROFITS OR GOODWILL, EVEN IF ADVISED OF THEIR POSSIBILITY.

8.2. The Rights Holder's total liability under this Agreement is limited to the amount the Licensee paid for the License during the 12 months before the event giving rise to the claim.

8.3. The limitations of this section do not apply where the law does not allow them (for example, with respect to consumer rights).

9. Term and Termination

9.1. This Agreement is in force for the term of the License.

9.2. The Rights Holder may terminate this Agreement if the Licensee breaches it and does not cure the breach within 30 days after notice.

9.3. On termination, the Licensee must stop using the Software and delete its copies, except in the case described in the last paragraph of section 4. Sections 4, 7, 8 and 10 survive termination.

10. General

Governing law: the laws of the Russian Federation. Disputes are resolved by the court at the Rights Holder's place of residence, unless the law provides otherwise.
Export control: the Licensee complies with applicable export and sanctions rules.
Entire agreement: this Agreement, together with the purchase confirmation, is the entire agreement of the parties about the Software. If any term is found invalid, the other terms remain in force.
Changes: new versions of this Agreement apply to new purchases and update renewals.
Contact: i@pfrolov.ru.