You infringe copyright if you do something with a work that you are not allowed to do, unless you have a licence. You do something with a work if you use it as a whole or a substantial part of it, either directly or indirectly. It does not matter if someone else did something with the work before you did. You can infringe copyright by doing things like copying or sharing a work without permission. This rule applies to what you do with a work, and it is important to understand what you are allowed to do. This part of the law is also subject to Parts 3 and 8, which you can read about by following the links to Parts 3 and 8. If you are not sure what you can do with a work, you should look at the rules carefully to make sure you are not infringing copyright.