In Australia you must always attribute creative commons material.
Many of the free creative commons images on the internet are from international website. They often say 'no need to attribute or acknowledge', which would be true if you were in a different country. The copyright rules in Australia are different and you must always attribute creative commons or public domain material, even if the original owner says you don't need to.
The only exemption is if the user has specifically purchased royalty free images.
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Anyone can upload images to flickr, but the photographer always reserves the right to decide what can be done with their picture.
Not all images on flickr have a creative commons licence.
To search flickr, enter a keyword in the search box.
In the results screen click on 'Any License' > select the relevant Creative Commons license for you. (For educational use, click 'All Creative Commons').
The results will then be limited to images that have a creative commons licence.
Don't forget to attribute all images you use.