Legal Question in Intellectual Property in Illinois

If da Vinci died last year (which he did not, he died in 1519), he would still own copyrights to the Mona Lisa. If you make a reproduction of a copyrighted work in any medium, adding your own creativity, your work is called a "derivative work." Making a derivative work requires permission or license from the copyright owner. Failure to obtain permission or license from the copyright owner for rights to make a derivative work is copyright infringement.

While the above answers your question, I would like to point out two things: 1) sale of a copy or derivative work is not a necessary element of copyright infringement; and 2) neither the failure to name the original artist nor giving credit to the original artist negates copyright infringement.