All publications by Arc Medieval Press protect our authors against misuse of their intellectual property, for which see our Rights and Permissions page.
The transfer of publishing rights to the publisher (copyright) from the intellectual property owner (author) is done through our contracts with authors.
Terminology in the field of copyright may be confusing, particularly since the English-speaking world uses terms based on one set of legal principles and continental Europe uses others. The effect is almost identical and almost all countries operate similar rules under the Berne Conventions. An excellent explanation of the US approach is provided here and an introduction to the European approach is available here.
For guidance on your use, as an author, of third-party material (that is, the copyrighted intellectual property of others), see here.