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| Subject | English | German |
| comp. | opt in | sich anmelden |
| comp., MS | opt in | abonnieren (To explicitly consent to participate. Typically used in marketing programs and offerings, whereby an action (such as the use of personal information beyond the original, primary purpose for which it was collected) is not undertaken unless an individual explicitly consents. An element of choice) |
| gen. | opt in | beitreten |
| med. | opting-in system | ausdrücklich erteilte Zustimmung |