Creative Commons provides alternative licenses whereby you can release some of the rights you are automatically assigned by copyright law.
The most open license is the Attribution license. With this you receive the greatest exposure for your work, since allows your work to be distributed anywhere or modified to someone's specific needs, while still giving you credit for its creation.
Other Creative Commons license choices specify whether you allow commercial use of the work, whether you allow modifications of the work, and whether you allow derivative works to be created based on your work.
When you submit content to Vallo Vault, you see a Creative Commons & Copyright section on the submission form that allows you to identify the license to be used with the item you are submitting, so people can know what they're allowed to do with your work. In this section, you will either select a CC license or indicate that you intend to retain your full copyright.