For those looking for a cheaper option for your book cover design, Creative Commons (CC) might be the license for you. A Creative Commons (CC) licence is a public copyright licence that enables the free distribution of an otherwise copyrighted work. These are free to obtain, however you must check if the image that you intend on using has any attribution requirements that has been licensed under the license terms. Here’s a breakdown of what may be required in order for you to use an image freely:
Creative Commons (CC): Creative Commons is an American non-profit organisation that allows licensing free of charge to the public. This symbol represents a free to obtain license and with a ‘0’ next to it requires no attribution.
Attribution (BY): Licenses may copy, distribute, display and perform the work and make derivative works and remixes based on it only if they give the author or licensor the credits (attribution) in the manner specified by these.
Share-alike (SA): Licensees may distribute derivative works only under a licence identical that governs the original work.
Non-commercial (NC): Licensees may copy, distribute, display, and perform the work and make derivative works based on it only for non-commercial purposes.
No Derivative Works (ND): Licensees may copy, distribute, display and perform only verbatim copies of the work, not derivative works based on it.