Creative Commons licenses allow that material to be shared and reused under terms that are flexible and legally sound. To learn more about how the Creative Commons license works, check out their FAQ.
Creative Commons (CC) licenses still require that you attribute the media to the original source. Common practice when looking at attribution is to use the acronym TASL:
For examples of good attribution, check out the Best Practices for Attribution from the CC website or a guide to attributing CC-licensed material developed by the CC Australia team.