When your article, book, or book chapter is accepted for publication, you as the author will sign a form laying out the terms of the publication contract between yourself as the author and the publisher in question. These contracts are obviously legally binding and it is important you know what you are agreeing to. If a publication has resulted from funding from an external organisation, then it may be a condition of that funding that any resulting outputs are made Open Access. It is critically important that these conditions are met as sanctions may apply. Make sure you take this into consideration prior to submission to a publisher.
The publication contract is not simply one-way: most contracts contain clauses requiring the publisher to act on your behalf in cases of copyright infringement or plagiarism; to ensure that your article is correctly catalogued and metadata-tagged to facilitate discovery by search engines; to negotiate permissions and licences for database aggregators, for example; to ensure your article is safely archived and a copy deposited in a Legal Deposit Library.
It is also important to check the contract for any clauses pertaining to Open Access or institutional repositories. The University of Derby, like most higher-education institutions, has its own institutional repository, known as UDORA. Many publishers permit authors to deposit a version of your manuscript in their institutional repository. It is likely that there may be an embargo period from the date of publication - again, it is important to check with your publisher or to check the SHERPA/RoMEO database for the particular publisher's policies.
Once a journal article has been accepted for publication, you are bound by the terms of the contract agreed between yourself and the publisher.
If you wish to re-use diagrams, illustrations or build on the research in a subsequent paper, you will need to seek permission from your publisher, as they will hold the copyright to the material.