Scope
These Terms of Use govern the agreement between you and Ludi GbR, Burnitzstraße 7, 60596 Frankfurt am Main, Germany, a civil-law partnership represented by its partners Nelson von Groll and Shezaf Yarden (“Ludi”, “we”, “us”).
They apply to every person who holds a Ludi account: practitioners who work with their athletes on the platform, and members who sign in to use the library.
By accepting these Terms you agree to be bound by them. Information on how we process personal data is set out in our Privacy Notice.
Privacy notice
The service
Ludi provides a knowledge base and professional tools for sport psychology, covering psychological constructs, assessments and interventions together with the evidence for each.
Ludi is currently in a pilot phase. During this phase we may add, modify or discontinue features.
Use of Ludi is currently free of charge. Fees apply only under a separate agreement with you.
Ludi supports professional judgement. It does not provide diagnosis or treatment and does not replace the assessment of a qualified practitioner.
Your account
Each account is personal to one individual and may not be shared.
You must keep your password and sign-in credentials confidential.
If you suspect unauthorised use of your account, notify us without delay at nelson@ludisp.com.
News about Ludi by email is optional and requires your separate consent, which you may give when accepting these Terms and withdraw at any time by writing to nelson@ludisp.com.
Obligations of practitioners
You are the controller within the meaning of the GDPR for the athlete data you enter. You determine which athletes are assessed, for what purpose, and how the results are used. We process this data on your behalf and on your instructions.
In particular, you are responsible for:
- ensuring a valid legal basis for the athlete data you enter;
- obtaining consent where required, including the consent of a parent or guardian for every athlete under 18;
- informing your athletes about how their data is used. Ludi provides a dedicated privacy notice written for athletes;
- the professional decisions you take in your work with athletes.
Our data processing agreement under Art. 28 GDPR applies to the athlete data you enter. You accept it together with these Terms.
Data processing agreement
Research with pseudonymised athlete data
This section governs Ludi’s own research with athlete data. It is separate from the operation of Ludi for you. For the operation of Ludi you remain the controller and Ludi your processor, and the data processing agreement continues to apply unchanged: Ludi processes athlete data only on your documented instructions (Art. 28(3)(a) GDPR).
For the research described here, Ludi GbR decides the purposes and means itself. It is therefore an independent controller of that research (Art. 4(7) GDPR), not your processor, and it bears the duties of a controller towards the athletes and the supervisory authorities.
Research may follow the same athlete over time. Each athlete therefore keeps one research identifier, and the data is pseudonymised, not anonymous. Pseudonymised data remains personal data (Art. 4(5) GDPR, Recital 26), and much of it is data concerning health (Art. 9 GDPR). Ludi treats it accordingly.
Research: purposes and data
Ludi uses the data only for scientific research in sport psychology, in particular on:
- how psychological constructs relate to each other;
- how personality relates to those constructs and to outcomes;
- how athletes change over time, and the effect of interventions;
- whether questionnaires measure reliably and validly (instrument validation).
Ludi uses only the following data, without names:
- answers and scores from individual questionnaires, check-ins and team questionnaires, which questionnaire was answered, in which version and form, for an injury check-in the injury phase it was set up for, and, for team questionnaires, the team and the round the answers belong to and the kind of leader rated;
- your assessments of the athlete: the construct scores, the items ticked in an observation, the constructs marked as reviewed, the kind of assessment (observation, AI-assisted draft, questionnaire, instrument or other) and its status;
- injury periods (the day each began and ended) and, at each questionnaire and assessment, whether the athlete was injured and the phase of the injury (before diagnosis, after diagnosis, return to sport);
- your intervention plans: the construct, the tool from Ludi’s catalogue, and the status of each tool and of the plan;
- completed sessions: the session type, the duration in minutes, the focus constructs, the catalogue tools used and the plan the session belongs to;
- the athlete’s sport where it is one of the sports listed in Ludi, type of sport and gender, and, at each questionnaire and assessment, the athlete’s age in whole years and the level of the squads the athlete belonged to.
No date of any entry is used. Each entry carries only a day number, counted from the athlete’s first entry. The only date released is the study’s release date; no entry dated after it is used, and data is released only once that day is over. The status of a plan, a tool or an assessment, the details of a current injury and squad membership are taken as they stand on the day of extraction.
Ludi never uses for research: names, contact details or dates of birth (the date of birth serves only to compute the age); anything entered as free text, including your notes, summaries, session notes, goals and locations; tools you created yourself; a sport typed in rather than chosen from Ludi’s list; the names athletes give in questions about teammates; mental health screens; or team questionnaires that promised athletes their answers would count only in the team’s total. Using any further category of data requires a new version of these Terms.
Where an athlete’s research consent was given to a version of Ludi’s privacy information for athletes older than 2026-09-29.2, Ludi uses only the questionnaire data in the first point above, without any injury phase, with sport, type of sport, gender and age, until the athlete chooses again. An injury check-in is itself such a questionnaire, and its instrument shows that the athlete was injured.
Research: legal bases
Ludi carries out this research on one of two legal bases:
- the athlete’s explicit consent (Art. 6(1)(a) and Art. 9(2)(a) GDPR), which the athlete gives or refuses in Ludi separately from everything else. Ludi accepts it from athletes of any age, whether or not their record has a date of birth. This is the basis Ludi uses today;
- research without consent where the law permits it: Art. 9(2)(j) GDPR with the safeguards of Art. 89(1) GDPR, under § 27 BDSG, which permits it where the processing is necessary for the research and Ludi’s interest in it substantially outweighs the athlete’s interest in being excluded. Every athlete may then object at any time (Art. 21(6) GDPR), and Ludi honours every objection without asking for reasons. Ludi uses this basis only after it has shown athletes the notice for it and has told you in advance. Athletes of any age are included, whether or not their record has a date of birth.
Athletes who refuse, withdraw or object are left out of research. Refusing has no effect on their support or on your use of Ludi.
Research: what you agree to and what you do
You agree that Ludi may make pseudonymised copies of the data listed above from your athletes’ records, including the assessments, injury periods, intervention plans and sessions you create, and use them, as independent controller, for the purposes above, for every athlete included in the research: under consent, an athlete whose latest research choice is yes, at any age. To that extent this is your documented instruction to Ludi, as your processor, to make that data available to Ludi’s research (Art. 28(3)(a) GDPR). No free text you write is taken: every field Ludi takes from these records is a fixed choice, an entry from Ludi’s catalogues or a number.
You undertake to:
- inform your athletes of Ludi’s research by pointing them to Ludi’s privacy information for athletes, which contains the research section;
- respect an athlete’s refusal, withdrawal or objection, and not press any athlete to take part;
- involve parents or guardians wherever the law applicable to you or to the athlete requires it;
- tell Ludi without delay at nelson@ludisp.com if an athlete tells you they withdraw or object, or if you know of a reason why an athlete’s data must not be used for research.
You may not ask Ludi for the research data of an individual athlete, and Ludi will not provide it.
Privacy information for athletes
Research: what Ludi guarantees
Ludi guarantees that:
- a research identifier replaces the athlete’s identity, and the key linking it to the athlete is stored separately from the research data;
- each study is recorded before any data is released for it, with its purpose, who approved it, its release date and its end date, and receives its own codes, so the data of two studies cannot be joined on an identifier;
- research data sits in a part of the database that the website cannot reach, no researcher has a login to Ludi’s database, and only the partners of Ludi GbR can access it there;
- Ludi does not attempt to re-identify any athlete, and uses the key only to produce the pseudonymised records and to give effect to a withdrawal, an objection or an erasure;
- neither you, nor an athlete’s coach or club, nor any other third party receives an individual athlete’s research data, except a research partner under the next section;
- results are published only in aggregated form, never as the data of one athlete;
- no data is released for a study after its end date; a study’s data is anonymised as soon as the research purpose allows (§ 27(3) BDSG), and deleted or anonymised when the study ends;
- when an athlete withdraws or objects, no further data of theirs is released for research; data already released to a study stays in that study until it ends, and no research partner can link it to the athlete; when an athlete’s record is erased, their research identifier is deleted with it;
- every extract of a study’s data is recorded in an append-only log, protected against alteration and deletion, with who took it, the kind of record, the number of rows and the time.
Ludi may add safeguards. It does not lower these.
Research partners and data protection officer
Ludi may carry out a study together with universities or other research institutions. A partner receives only the coded data of that study, never a key, and only after signing a written agreement with Ludi that binds it to use the data only for that study, to make no attempt at re-identification, to pass nothing on, to protect the data with appropriate technical and organisational measures, to publish only aggregated results, and to delete or anonymise the data when the study ends.
Ludi transfers research data to a partner outside the European Union or the European Economic Area only where the conditions of Chapter V GDPR are met (Art. 44 GDPR).
Ludi has not yet appointed a data protection officer. Once one is appointed, their name and contact details are given here and in the privacy information for athletes. The data protection officer monitors Ludi’s compliance with data protection law, including in its research (Art. 39(1)(b) GDPR), and athletes may contact them directly (Art. 38(4) GDPR). Until then, write to nelson@ludisp.com.
Acceptable use
You may not use Ludi to:
- store or share unlawful content;
- scrape the platform or download its content in bulk, whether manually or by automated means;
- access data you are not authorised to access, or circumvent its security measures;
- resell access or make it available to third parties;
- copy its content in order to build a competing product or to train an AI model.
If you breach these rules, we may suspend or close your account.
Content and intellectual property
The library and the texts, summaries, ratings, tool descriptions and recommendations in Ludi are created by Ludi and protected by copyright. The library is also protected as a database (Sections 87a et seq. of the German Copyright Act, UrhG). All rights in them remain with us.
You may use the library for your personal use only. Without our prior written consent you may not copy, reproduce, distribute, publish or sell its content, in whole or in part, or use it for any commercial purpose, except as set out in the next paragraph.
As the one exception, sports psychologists may apply what they read in Ludi in their own professional practice with their athletes. This does not permit copying, reproducing or distributing the content.
Rights in published papers and instruments cited in Ludi remain with their authors and publishers. Ludi refers to these works but does not license them to you.
You retain all rights in your data. You grant us only the rights necessary to store and process it in order to provide Ludi to you, and to use it for research as set out in the section Research with pseudonymised athlete data.
Availability and changes to the service
During the pilot phase we provide Ludi on a best-efforts basis. We do not warrant that it will be available at all times or free of errors.
We will inform you in advance of changes that materially affect your use of Ludi.
Liability
We are liable without limit for intent and gross negligence, and for injury to life, body or health.
For slight negligence we are liable only if we breach an essential obligation: one whose fulfilment makes the proper performance of this agreement possible at all and on whose observance you may regularly rely. Our liability is then limited to the foreseeable damage typical for this kind of agreement.
Liability under the German Product Liability Act is not affected.
These limits also apply to our legal representatives and vicarious agents.
Within these limits, we are not liable for loss arising from data you enter or from decisions you take using Ludi.
Termination
You may stop using Ludi at any time. To have your account and its data deleted, write to nelson@ludisp.com. You may request a copy of your data before deletion.
We may terminate the agreement by giving notice by email. We may terminate it with immediate effect if you seriously breach these Terms.
Changes to these Terms
If these Terms change, the version shown at the top changes with them, and you will be asked to accept the new version on your next visit before you continue.
If you do not accept the new version, you may stop using Ludi and ask us to delete your account.
Governing law and jurisdiction
German law applies. If you use Ludi as a consumer, you keep the protection of the mandatory provisions of the law of the country where you habitually live.
If you are a merchant (Kaufmann), a legal person under public law or a special fund under public law, the exclusive place of jurisdiction for all disputes under this agreement is Frankfurt am Main.
Severability
If any provision of these Terms is invalid, the remaining provisions remain in effect. The invalid provision is replaced by the applicable statutory provision.