Filme » Are iTunes HD movies just upscaled SD??

Hello,
I've noticed that the iTunes Store is now offering a huge amount of so-called HD content on the Apple TV. In fact, there may be several thousand HD movies that are available for either rent or purchase.

The question is, however, are these movies really coming from newly remastered HD sources or are the movie studios just taking their existing DVD masters and re-encoding them to 720p? There appear to be many, many films that are in iTunes HD that have yet to be remastered for Blu-ray.

Does anyone know what the typical scanning resolution is/was for DVD production? It was probably higher than straight, standard definition NTSC but was it as high as 1280x720? Note that 1280x720 is close to 1K, so perhaps that was the standard for DVDs. If DVDs did come from 1K scans then one could well image that it won't take very long for nearly every DVD source to be available in 720p on the iTunes Store (as well as from Netflix, Amazon Video On Demand, etc.).

Further, I could well imagine that if 1K scans were used for DVDs then that could establish 720p as the standard for online distribution (with the sheer number of available movies beating out remastering efforts for true 1080p content).
Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://arstechnica.com/civis/viewtopic.php?t=50659
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Thank you

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