If I find something on the web, such as films, text or images, are there rules on how I can use it?

The placing of an image, text or film on the internet does not mean it can be used freely by people who find it, copyright may still exist.  Therefore, you should seek permission from the copyright owner before using the work.

If you were to use copyright protected material belonging to someone else without permission, you may be liable for copyright infringement.