Multiple entries are not allowed. No cash payments shall be made, nor shall it be possible to change or exchange the prizes. Competition winnings are non-transferable. ZEISS reserves the right to disqualify from the competition any persons who attempt to gain advantages through manipulation. Winners will be selected by drawing lots and will be informed by email. If the prize cannot be accepted by the winner for legal or factual reasons or if the winner does not respond to the notification of the prize within seven days, the prize shall no longer be valid, and ZEISS shall be entitled to draw lots for a substitute winner. Data shall be treated as confidential and handled in accordance with the legal data privacy regulations and shall be retained in conjunction with this contest only. All decisions are final and there is no legal recourse.