Free images results:
 

Padlock pictures, stock photos and images

 
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Padlock Stock Images
Author: Js10053
Locked Stock Image
Author: Kmitu
Locked #2 Royalty Free Stock Image
Author: Kmitu
Rusty Lock Royalty Free Stock Image
Author: Ichtor
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Padlock. Royalty Free Stock Photo
Author: Iofoto