Copyright.

What kind of work can be protected? A print, Published work, film, record literary, artwork and musical material.

How is your work protected? Your work is protected by your Copyright, you create your own terms and conditions. Dating your work to prove that it was you that created it. You can also mark your work using watermarks, although sometimes people can remove these, which you can also take them to court for. You can also use the copyright symbol in your work. There is also the poor mans copyright where you mail the work to yourself but don't open the package. The copyright owner of an artistic work has the following exclusive rights:
Reproduction right, or the right to copy the work, distribution right, or the right to issue copies of the work to the public, rental or lending right, or the right to rent or lend the work to the public, the right to communicate the work to the public by broadcasting or electronic transmission.  It is up to the copyright owner whether anyone else can do any of the above with their works.

How long does copyright last for your kind of work? Your copyright expires 70 years after an artist dies.

What can you do if you find someone has copied your work? If someone has used your work in any way you can either contact them and ask them to stop using it or make them pay for the work they have used. Consider mediation. You can also seek legal advice. If you decided to take them to court there can be many solutions to the issue.

How would you lose copyright of your work? You can sell your copyright to someone but this is usually not a good decision to make. Your copyright also expires when you die. The company you work for can also use your copyright if you sign an agreement.

What does the public domain mean and how and how does copyright impact this? 70 years after  the creator of the art piece/film etc. has died their copyright expires and their work can be used in any way, for example Alice in Wonderland has been re-created many times.