A license is simply a non-issue if you don't publish it. Licensing implies publishing.
Not really. You have to take into account the licence of any code you use when you use it, so you know what you're bound to in the future. e.g. in taking the decision to mix GPL code with your own, you define what you can and can't do with your program in future. Like publish it under the terms you want. If you never intend to publish the code, then it doesn't matter so much, but it still means you can never give a copy to a friend, etc. -- "...our desktop is falling behind stability-wise and feature wise to KDE ...when I went to Mexico in December to the facility where we launched gnome, they had all switched to KDE3." - Miguel de Icaza, March 2003