by courtesy of meaning

• 1. With the permission of
  2. By the favour of

• courtesy:    Noun: courtesy&nbs ...
• courtesy of:    1. With the permis ...
• curtesy, courtesy | curtesy | courtesy | courtesy curtesy |:    [Law]CURTSEY (DOWE ...

Examples

1. mr. windaus used the photograph by courtesy of the publisher.
2. photo provided by courtesy of mr . tang hin po
3. image by courtesy of hong kong tourism board
4. film programmes by courtesy of national geographic channel
5. photos by courtesy of public relations office, university of macau