Copyright for it is ultimately held, at least in part, by BBC Worldwide through a license extended to Big Finish Productions. It is believed that the use of this image — to illustrate an article discussing an aspect of the story in question, the cover in question, or the artist who created the image, on the Tardis Data Core wiki, hosted on servers in the United States of Wikia, Inc — qualifies as fair dealing under the laws of the United Kingdom, Canada, and Australia, and as fair use under United States copyright law. Other use of this image, on Wikia or elsewhere, may be copyright infringement. See Wikipedia:Fair use for more information.
To the uploader: please add the source of the work and copyright information. If the image comes from a bonus booklet or liner notes, please make this explicitly clear, since it's possible to legally purchase Big Finish audios without also receiving these images.