We want to make our software free for using with free RDBMS (and commercial for using with commercial RDBMS). What is the best way to do this?
We haven't found any public well-known license for that, so, the way I see it, we have 2 options: 1. Write our own license (which is not good because everyone should read it, and not everyone would do that). 2. Use some free license without right to modify software (and not including support of commercial RDBC in the distribution package under that license). Also we want to make our software open-source in time. But the problem is that we also have not found any public well-known for that (i.e. free or free open-source license without (!) right of modification).
So maybe someone can suggest something? Maybe we are missing something simple in that situation?