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Choose what this site may use. Strictly necessary storage is always on because the site cannot work without it. Your choice is kept on this device for six months, then we ask again. Cookie policy

• Strictly necessaryAlways on

  Only what the site needs to work — such as your language, light or dark appearance, the choices you make here, and securing forms and sign-in where there are any. Never used to track you, never shared with advertisers.

  Sign-in cookies mdr_at and mdr_rt and the device id mdr_did, the theme cookie mdr_theme, your choice here (mudarraj.consent.v2), the guest cart mdr_cart_v1, the questions you flag during a quiz (mdr.quiz-flags.*), and mdr.room.policy-reload, which lets the live room reload once when the camera is blocked. All set by this site only.

• Preferences

  Remembers optional settings you choose between visits.

  mdr.room.devices: the camera and microphone you picked in the live-room lobby, so you need not pick them again. Set by this site only.

• Marketing

  Measures which ad or campaign brought a visitor — and lets an ad platform show you our ads elsewhere only if the line below names one.

  mdr_ref: the referral code from a shared link (?ref=) is kept on your device so a purchase credits the person who sent you here; the code is only sent with an order you place yourself. YouTube (Google): lessons an academy hosts on YouTube load straight away instead of waiting for you to press play, and YouTube may then store its own identifiers on your device. No ad platform.