Terms of study and payment

Version dated 3 September 2026

1.1. These Terms of Study and Payment (the “Terms”) govern the use of online.lidenz.ru, the purchase of course packages and participation in distance learning.

1.2. The educational services are provided by:

ЧОУ ДО Курсы «Лингва Консалт (Языковой Консультант)»

• Primary State Registration Number (OGRN): 1037843038078

• Taxpayer Identification Number (INN): 7825669155

• Registered address: Premises 12N, Building A, 3 Zhukovskogo Street, St Petersburg, 191014, Russian Federation

• Educational licence No. 4008 dated 25 October 2019, issued by the Committee for Education of St Petersburg

• Email: online-support@lidenz.ru

hereinafter referred to as the “Provider” or “Liden & Denz”.

1.3. An individual who purchases services for their own use is referred to as the “Student”. An individual or legal entity that pays for another person’s studies is referred to as the “Customer”. If the Student pays for their own studies, they are also the Customer.

1.4. These Terms apply together with the agreement for the provision of paid educational services and the information about the selected course and package displayed on online.lidenz.ru at the time the order is placed. In the event of a conflict, the individual terms of the concluded agreement and the mandatory requirements of the laws of the Russian Federation shall prevail.

1.5. Creating an account does not in itself oblige the user to purchase paid services. The terms of a specific course are determined when the course and package are selected and are confirmed when the order is placed.

2.1. The Provider offers individual and group distance-learning classes in foreign languages.

2.2. The language of study, programme, level, format, number and duration of lessons, price, period of study and other characteristics are stated on the relevant course page, during checkout, in the personal account and, where applicable, in the agreement for the provision of paid educational services.

2.3. Lessons are conducted remotely using the BigBlueButton virtual classroom. The Provider may temporarily use another comparable platform if this is necessary for technical or organisational reasons, subject to prior notice to the Student.

2.4. The Provider may improve the programme content, learning materials and teaching methods, provided that this does not reduce the paid scope of services or alter their essential characteristics.

2.5. A certificate or other document confirming completion of a course is issued only in the cases and subject to the conditions expressly stated in the description of the relevant course or in the agreement.

3.1. To purchase a package, book lessons and use the platform’s services, the Student creates a personal account.

3.2. The user must provide accurate information, keep it up to date and not give other persons access to their account.

3.3. The user is responsible for keeping their password confidential and must notify the Provider immediately if unauthorised access to the account is suspected.

3.4. The correct time zone must be selected during registration. The timetable and the deadlines for booking, cancelling and rescheduling lessons are displayed according to the time zone set in the Student’s account.

3.5. Information about purchased, scheduled, completed, cancelled and remaining lessons is displayed in the personal dashboard. If the Student discovers an error, they must notify the Provider without undue delay.

4.1. The price of the course or package, the payment currency and the available payment methods are stated before the order is placed.

4.2. Unless expressly agreed otherwise with the Provider, services must be paid for in full before the start of study.

4.3. The payment obligation is deemed fulfilled once the payment organisation has confirmed a successful payment and the purchased package is shown in the personal account, or once the Provider has otherwise confirmed payment.

4.4. If a promotional code or an individual discount is applied, the price is calculated taking that discount into account. A promotional code cannot be exchanged for cash and applies only on the terms stated when it is issued.

4.5. Users who cannot use Russian payment methods may be offered a link to a separate foreign payment page. With this method of payment:

• the educational services continue to be provided by ЧОУ ДО Курсы «Лингва Консалт (Языковой Консультант)»;

• the foreign legal entity or payment partner accepts the payment but does not replace the educational-services Provider

• before leaving the site, the user is informed of the payment recipient, currency, amount and applicable payment terms

• bank-card details are entered directly on the payment page

• after payment, the Provider receives the information required to confirm the payment and credit the package to the account

4.6. Bank or payment-system fees and currency-conversion costs, where not included in the stated price, are payable by the Customer.

5.1. After purchasing a package, the Student may select an available teacher or ask the Provider to select one. The selection takes account of the language, level, objectives, time zone and available timetable.

5.2. The availability of a particular teacher for every date requested by the Student is not guaranteed. The Provider may replace a teacher for organisational reasons, while preserving the format and paid scope of study.

5.3. The Student may request a change of teacher. A change of teacher does not require additional payment and does not reduce the number of paid lessons remaining.

5.4. The duration of individual lessons is:

• English or German trial lesson - 30 minutes

• subsequent individual English or German lessons - 45 minutes

• individual Russian lesson - 50 minutes

• for other courses, the duration stated on the course page and during checkout

5.5. A trial lesson is intended to introduce the teaching format, establish the Student’s objectives and provide a preliminary level assessment. Unless otherwise agreed by the Provider, a Student may purchase or receive no more than one trial lesson for each language studied.

6.1. An individual lesson may be booked no later than 18 hours before it begins.

6.2. The Student may cancel or reschedule a lesson without losing it no later than 18 hours before the scheduled start, using the personal account or another method made available by the Provider.

6.3. If a lesson is cancelled or a rescheduling request is made less than 18 hours before the start, or if the Student fails to attend, the lesson is considered used and is deducted from the package.

6.4. A Student’s late arrival does not extend the lesson. The teacher may end the lesson at the originally scheduled time. If the Student has not joined within 15 minutes after the start and has not reported a delay, the lesson may be treated as missed through the Student’s fault and deducted from the package.

6.5. If the lesson is cancelled by the Provider or the teacher, it is not deducted. The Student may select another time and, where necessary, the package validity period is extended by the time required to reschedule the lesson.

7.1. The validity period of an individual package begins on the date on which it is credited to the personal account, unless a different start date is stated at the time of purchase.

7.2. The following validity periods apply to all languages:

• trial lesson - 7 calendar days

• package of one regular lesson - 30 calendar days

• package of 10 lessons - 60 calendar days

• package of 25 lessons - 60 calendar days

7.3. The Student is responsible for planning lessons so that the package is used before the expiry date shown in the personal account.

7.4. After the validity period expires, unused lessons can no longer be booked. The Provider may extend a package following a substantiated request from the Student. An extension is not automatic, except where the timely use of the package was prevented by the Provider.

7.5. The rules concerning package expiry do not restrict the Customer’s rights to withdraw from the agreement and receive a refund in cases provided for by the mandatory provisions of the laws of the Russian Federation.

8.1. The start dates, course duration, lesson days and times, number of teaching hours, group size and price are stated on the course page and confirmed when the order is placed.

8.2. One group lesson lasts 50 minutes. A single group meeting may consist of several consecutive lessons. The number of lessons per week and the duration of each meeting are stated in the course timetable.

8.3. Open group courses are held in groups of no more than 6 Students, unless otherwise stated in the description of a particular course.

8.4. To participate in a group course, the Student must complete the required online test and, where required for the selected course, an oral level assessment. The Provider may propose a different group if the Student’s actual level does not correspond to the selected course.

8.5. A group lesson missed by the Student is not provided to that Student individually, is not rescheduled and is considered to have been delivered because the group continues according to the established timetable.

8.6. If a group cannot be formed or it becomes impossible to continue the course, the Provider offers the Customer one or more of the following options:

• transfer to another suitable group

• postponement of the start of study

• individual tuition in an agreed scope

• refund of the price of services not provided

The selected option is agreed with the Customer.

8.7. The Provider may replace a group teacher or reschedule an individual class for a valid organisational or technical reason. Students are notified in advance insofar as possible. A class cancelled by the Provider is held at another time or compensated in another agreed manner.

8.8. The minimum age for participation in an open group course is 16, unless otherwise stated in the course description. A minor may participate with the consent of their legal representative.

9.1. The Student is responsible for providing:

• a stable Internet connection

• a functioning computer or other compatible device

• a functioning microphone and headphones or speakers

• a compatible, up-to-date browser

• the ability to use BigBlueButton and receive messages from the Provider

9.2. The Student is advised to test their equipment and connection in advance. Technical problems on the Student’s side do not in themselves entitle the Student to automatic reinstatement of a lesson.

9.3. If a lesson cannot take place or is substantially interrupted because of a technical fault on the Provider’s side or in the infrastructure used by the Provider, the lesson is not deducted or is reinstated in the package.

9.4. In the event of a brief technical interruption, the parties endeavour to continue the lesson once the connection has been restored. A decision on rescheduling or reinstating the lesson is made taking into account the duration and cause of the interruption.

9.5. The Provider does not guarantee uninterrupted availability of the website during scheduled maintenance, communications failures or circumstances outside the Provider’s reasonable control, but takes reasonable steps to restore the services.

10.1. The Customer may withdraw from further study by sending the Provider a written notice to the email address specified in Section 1 of these Terms.

10.2. If the Customer withdraws, the refund is calculated from the amount actually paid, less:

• the price of lessons already conducted

• lessons considered used under these Terms because of late cancellation or non-attendance

• the Provider’s documented costs actually incurred and directly connected with performance of the particular agreement

10.3. For the purpose of calculating a refund, the price of lessons used is determined in proportion to the price of the package purchased, unless otherwise stipulated by an individual agreement or mandatory law.

10.4. To enable the request to be considered, the Customer must provide information sufficient to identify the account, order and payment, as well as the details required to make the refund.

10.5. A refund is made using the same method as the original payment, where technically possible and permitted by the payment organisation’s rules. If payment was made through a foreign payment page, the refund may be processed by the relevant payment partner.

10.6. If the Provider cancels a course, the Customer is refunded the price of services not provided or, by agreement, is offered an equivalent replacement.

10.7. This Section does not restrict the rights granted to the Customer and Student by the laws of the Russian Federation on consumer protection and education.

11.1. Where the description of the purchased package provides for a textbook or other materials, they are supplied in the stated format and within the time communicated to the Student.

11.2. Learning materials, recordings, texts, assignments, images, presentations and other intellectual-property items are provided solely for the Student’s personal study.

11.3. Without the rights holder’s written permission, it is prohibited to:

• provide materials to third parties

• make them publicly available

• sell, copy or distribute them beyond the permitted personal use

• record, publish or broadcast lessons or extracts from them

11.4. Access to materials does not constitute a transfer of exclusive rights to them.

12.1. The Student must treat teachers, employees and other participants respectfully and must not disrupt lessons.

12.2. Insults, threats, discriminatory statements, the distribution of unlawful content, giving unauthorised persons access to the virtual classroom and other actions that infringe the law or the rights of other persons are prohibited.

12.3. In the event of a material or repeated breach of the rules, the Provider may restrict the Student’s access to lessons or terminate the agreement in the cases and manner permitted by law and the agreement.

13.1. The Provider is responsible for ensuring that the services correspond to the selected course, the paid scope and the applicable legal requirements.

13.2. The Provider does not guarantee that a particular language level will be achieved within a specified number of lessons, as the outcome depends, among other things, on the Student’s starting level, attendance, independent study and compliance with the teacher’s recommendations.

13.3. A party is released from liability for failure to perform obligations caused by extraordinary and unavoidable circumstances that it could not reasonably have foreseen or prevented. The party must notify the other party of such circumstances without undue delay.

13.4. If such circumstances continue for an extended period, the parties agree on postponing the course, changing its format or terminating the agreement and settling payment for services actually provided.

14.1. Questions, notices of withdrawal from study, refund requests and complaints should be sent to: online-support@lidenz.ru

14.2. The enquiry should state the first and last name, the email address associated with the account, the relevant course or order details and the nature of the request. Full bank-card details must not be sent.

14.3. The Provider considers enquiries and responds within the periods established by the laws of the Russian Federation.

15.1. Relations between the Provider, the Customer and the Student are governed by the laws of the Russian Federation. A consumer’s statutory rights to select an available remedy and the competent court are not restricted.

15.2. The Provider may amend these Terms as a result of changes in the law, the services offered or the operation of the platform.

15.3. A package already paid for is governed by the version of the Terms in force when the order was placed, unless subsequent changes improve the Customer’s position or are mandatory by law.

15.4. The current version of the Terms is permanently available on online.lidenz.ru and states its version date.

15.5. During registration, the user confirms acceptance of the platform rules. When purchasing a paid package, the Customer separately confirms acceptance of these Terms and the terms of the selected course. The fact of acceptance, the date, time and version of the document are retained by the Provider.

15.6. The processing of personal data is governed by a separate Personal Data Processing Policy and a separate Consent to Personal Data Processing. Consent to receive marketing communications is given separately and voluntarily.