I think that one problem regarding creating a script to download photos form Flickr is getting copyrighted material. Suppose that you want all photos from Itajubá city. You can use Flickr API or an YQL request, as follows:

select * from flickr.photos.search where text="itajubá"

My first try to get license information was showing the pertinent part of JSON output. You could see that there isn’t a field telling that, but if you look at documentation there’s a “license” parameter.

“farm”: “5″,
“id”: “4458853758″,
“isfamily”: “0″,
“isfriend”: “0″,
“ispublic”: “1″,
“owner”: “76062736@N00″,
“secret”: “9edcd7aea8″,
“server”: “4003″,
“title”: “Clube”

Flickr! has seven options to licensing your photo (again I didn’t found in documentation, I tried each one)

• None (All rights reserved) [ license="0" ]
• Attribution-NonCommercial-ShareAlike Creative Commons [ license="1" ]
• Attribution-NonCommercial Creative Commons [ license="2" ]
• Attribution-NonCommercial-NoDerivs Creative Commons [ license="3" ]
• Attribution Creative Commons [ license="4" ]
• Attribution-ShareAlike Creative Commons [ license="5" ]
• Attribution-NoDerivs Creative Commons [ license="6" ]

My friend was looking to a way to download all photos from Yahoo! Open Hack Brazil so I decided to create a quick way to get theses photos (respecting copyrighted material). My query looks like:

select * from flickr.photos.search(0,2000) where tags="brhackday" and license="1,2,3,4,5,6"

After tests I put the URL from YQL virtual console in my Python code (that parses JSON) and generate a Shell Script to download (using curl/wget)

import simplejson
import urllib 
 
f = open("download.sh","w+")
f.write("#!/bin/sh\n")
i = 0
while True:
 
	url_base="http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20flickr.photos.search(" + str(i) 
+ "%2C" + str(i+100) +")%20where%20tags%3D%22brhackday%22%20and%20license%3D%221%2C2%2C3%2C4%2C5%2C6%22
&format=json" 	
 
	rest = simplejson.load(urllib.urlopen(url_base))['query']
 
        if rest['count'] == '0':
		f.close()
		exit() 
 
	photos = rest['results']['photo'] 
 
	for photo in photos:
		id = photo['id']
		owner = photo['owner']
		d = "curl -s http://www.flickr.com/photos/%s/%s/sizes/o 
| egrep \"<p><img src=\" 
| sed 's/<p>//g ; s/<br \/>//g ; s/<\/p>//g ; s/<img src=\"//g ; s/\" \/>//g' 
| xargs wget ;" % (owner, id)
		f.write(d+'\n')
		i += 100
 
f.close()

Probably If you cut & paste the code they will not work due some indentation issue, so I published in gist here.

The usage I simple:

$ python flickr-d.py
$ sh download.sh

This was a extremely simple workaround but I expect you enjoy!