Copyright of your published work
It is important to know who owns the copyright of your work. Is it:
Copyright agreements with your publisher
Many publishers require that authors sign a copyright agreement or transfer copyright to the publisher on submission of their work. These agreements vary from publisher to publisher and may prevent the author(s) from distributing their own work.
Some journals have changed their policies and now allow authors to retain copyright. Others require a sign-over but license authors to place a copy of their work on their personal web page or in an institutional repository. Some also allow authors to copy the work for teaching purposes.
Keeping the copyright
We would encourage you to keep copyright wherever possible. There are a number of things you can do:
What about 3rd Party Copyright?
If you have included content where the copyright is owned by someone other than yourself (this may include a diagram, text, photo etc) you do not necessarily have permission to re-use the material. You may need to obtain permission the owner of the copyright if for example you want to deposit the material in an institutional archive