With your registration on card2brain, you undertook to respect copyright and related property rights of third parties. The copyright law is not quite easy to understand, reason why we compiled the most important principles and put together some guidelines for you.
A copyright infringement can only occur once you disseminate your learning contents, that is, if you create public sets of flashcards or unlock private sets of flashcards for other users. As long as you create private sets of flashcards for your own studies alone, you cannot infringe any copyrights.
As a teacher, pupil, student, or lecturer, you benefit from copyright privileges insofar as you may also disseminate in fact copyright-protected contents such as pictures or charts without approval by the author under certain conditions (cf. "Limitations on copyright in an educational environment").
The following guidelines are not exhaustive and see themselves as a basic code of good practice.
It is your own responsibility not to infringe copyright. We do not take any responsibility or liability for losses or damage resulting from copyright infringements. In case of doubt, we recommend to refer to further legal documents or a legal person.
Teachers and students at schools and institutions of higher education benefit from copyright privileges. They are legally allowed to disseminate copyright-protected contents such as pictures and charts even without consent under certain conditions.
Every person has 'a right to their own image'. This means you are not allowed to publish or disseminate any pictures of people who can be clearly identified without their approval. For the consent to be legally binding, it is best to get it in writing.
There are some exceptions to the right to one's own image. However, if you stick to the basic rule, you will always be on the safe side.
You will find very many images under a Creative Commons licence you can use freely, especially on the Internet (e.g. on Wikipedia). In order not to unintentionally infringe the licensing terms when you upload these kinds of pictures, you can choose or pass on the licence suitable for every picture.
You can also put pictures, charts, graphs etc. created by yourself under a Creative Commons licence. Thus, it is up to you to set the conditions under which you pieces of work may be disseminated.
If you respect third parties' rights when creating a set of flashcards, you can put the whole text contents of the newly assembled work under a Creative Commons licence and determine the conditions for the dissemination and editing of your text work.
You can find the range of available licence models for images and texts here.