For the "Majority" of software It's perfectly legal to make a "personal" copy of a medium in order to preserve the original. It's when you make a copy for "ANY OTHER" purpose, weather for monetary gain or not, is when you re in violation of copyright infringement & software piracy.
And if don't agree with this answer then,
NOW ANSWER THIS....
If you use Microsoft products in EVERY aspect in the invention of software that becomes a multimillion dollar success, CAN MICROSOFT claim part owner because you used software you did NOT own?
If so , WHY?
If not, WHY NOT?