The term 'copyright checker' refers to the 'Check Permissions' service, which is provided by the Copyright Licensing Agency (CLA). CLA is a UK non-profit organization that is established with an aim to assist customers legally copy, access, and share the published material they need, while also ensuring that owners of the copyright (authors, publishers, and visual artists) are paid fair royalties for the use of their work.
This search tool gets access to a database of over 17 million publications to identify what is covered under each type of CLA license as well as NLA media access education licenses and the Schools Printed Music Licence. You can start your search by entering a term, or a number of terms into the search box; you can choose to use any of the terms below: the title of a publication, a contributor (author) name, a website URL, and an ISBN or ISSN identifier. To make sure you receive an accurate result for your license type, you need to choose the correct sector from the drop-down list at the top left of the results page, under the heading 'Show Results by Licence Sector'.