/usr/lib/cups/backend/ is in cups-daemon 1.7.5-11+deb8u2.
This file is owned by root:root, with mode 0o755.
| File | Mime Type | Owner | Mode | Size | 
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    ..
    
        
    
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    /usr/lib/cups/backend/http
    
        
    
 | root:root | 0o777 | ||
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    /usr/lib/cups/backend/https
    
        
    
 | root:root | 0o777 | ||
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    /usr/lib/cups/backend/ipp
    
 | application/x-sharedlib | root:root | 0o755 | 78.1 KB | 
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    /usr/lib/cups/backend/ipp14
    
 | application/x-sharedlib | root:root | 0o755 | 50.1 KB | 
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    /usr/lib/cups/backend/ipps
    
        
    
 | root:root | 0o777 |