Originally Posted by AdultKing

You can ask the same question many times, no point expecting a different answer.

If content is SD then it is SD. You can't make SD content HD content just as you can't make a 640x480 photograph 1280 x 960. You can resize it, filter it, sharpen it, do whatever - you'll probably make it look a little bit better, however in the process introduce new artefacts. Regardless it's still only as good as the source content.