So, if you have not paid for the commercial license (ie: Student license, 'borrowed' from work, using the demo, or using a cracked/patched copy) you are potentially opening yourself up to a hefty lawsuit. However, I'm not sure if you are familiar with the EULA, nor what edition of those programs you are working with, but anything other than a commercial license for either (or both, if you plan on using them both) of those programs, it is illegal to use them in a commercial project. Maya and Max are both fantastic programs, and with a little work, the toon rendering can be an effective solution to your problem.