Cookies and consent

Necessary (always on): session (pk_sid), request-forgery protection (pk_csrf), authorized device (pk_dev) and your consent choice (pk_consent).

Optional (only if you accept): our own usage metrics with a pseudonymous identifier and non-personalized advertising outside the lessons. You can change your choice from Account › Privacy or by deleting the cookies.

We don't use third-party cookies in V1.