HI Jiyeon,
You are welcome to and encouraged to use CODAP as part of your assessment items. We ask that where you embed CODAP you acknowledge CODAP and provide a link back to our main site. So, that would look like this: CODAP software created by the Concord Consortium. https://codap.concord.org
Note, if you are creating your own CODAP documents from scratch that acknowledgement is all you need. However, if you want to use any existing data from example documents that we provide, please contact us before doing so.