Creative Commons (CC) licenses give people “a simple, standardized way to grant copyright permissions to their creative work” (Creative Commons). Instead of requiring each person wanting to use, share or adapt the creative work to ask permission, a CC license allows the creator to indicate upfront what they will and won’t allow others to do with their work.
https://press.rebus.community/makingopentextbookswithstudents/chapter/cc-licensing-guide/