I also noticed you've used "PAR" a few times.
- If PAR = "picture aspect ratio", then PAR = DAR = AR, and PAR=DAR because you only see picture when it's displayed.
- If PAR = "PAL aspect ratio", then there is no such term. PAL is not inclusive to the topic of AR, but there are PAL version AR/DAR and SAR
... I'm starting realize when I hate tech jargon again. I feel like I'm speaking Klingon. "Par, sar, ar, tar, gar!"