I found a template for a Code Work For Hire contract on the web that really matched what I wanted in a contract so I went through it and significantly swapped stuff around and re-worded it to match my work which is art for interactive media. I've spent so much time researching and the agreement is almost complete. The one thing that still stumps me was the reference to a licence in the section that prevents the ownership of intellectual property that isn't specific to the Client's project. It was almost exactly what I needed to protect my work to have non-exclusive usage rights, but the catch is that it's talking about software when I need it to be about art. I've spent a lot of time trying and failing to find an equivalent licence. Am I missing the perfect licence somewhere, or should I be taking the MIT licence and changing it to suit my needs? If so, is it legal under Intellectual Property Law to do so?