Unfortunately due to frequently changing url structures, the links for several of the sources on https://search.creativecommons.org/ do not apply CC license filtering correctly. This could be quite detrimental to users as it means they may incorrectly and inadvertently use non-CC licensed works.

Sources whose results are not being filtered down to CC-licensed works only include:

• Soundcloud
• Wikimedia Commons
• Google Images

Sources which are broken completely include:

• ccMixter