This keeps coming up in the support queue, often in this form: “I have 12 licenses but I can only run Softimage on 3 machines at a time”. This happens because somebody tried to combine license files.
You cannot combine license files of the same product. For example, if you have one Softimage Advanced license for 9 seats, and another Advanced license for 3 seats, you cannot put them together in one .lic file. You’ll end up either with 9 or 3 licenses, depending on the order of the licenses in the .lic. The last license in the file supersedes the others.
You can combine licenses of different products. For example, Max 2010 and Softimage 2010. Or Softimage and Softimage Advanced.