I just read that under BSD, Apache, and MIT Licenses, one can use, modify and redistribute source code in a product as long as credit for the open source portion is given back to the the author. That seems clear (and significantly different from GPL).
However, is it legally acceptable to try and patent a piece of software if that software uses a BSD Licensed open source file as library (or support) code?
Edit: Not asking if one can patent the open source (BSD Licensed portion) rather the unique software that was written on top of the open source. Can that be patented?