Cam: Some regular at audience-level aims a camera at the screen, usually with poor results. Easy to detect when the person in the next row gets up to go to the bathroom, if nothing else.
TS: "Telesync". Usually an inside job by a projectionist or similar, often with excellent audio (but sometimes not). Camera is usually very stable with an unoccluded view; these can be hard to detect if a viewer isn't paying particularly close attention.
Screener: Once upon a time, people with influence in things like the Academy Awards were sent physical copies of films to watch and judge a film at home. These copies were called screeners. Not as often a thing these days (with limited-access online streaming being a largely-solved problem), but they could be both very high-quality and very early. Sometimes, they included things like a periodic scroller or crawler that informed unaffiliated viewers that they were not allowed to be watching the thing they were watching. Sometimes, they also had one-off watermarks that were intended to show the source of a leak[1].
In the realm of leaky films, screeners were/are usually the superior format by a wide margin.
[1]: https://waxy.org/2014/01/ellen_degeneres_walter_mitty_screen...
They started with a mission "for the gamers" to preserve consumer rights and force Rockstar to publish physical copies of the game, and it ended with them streaming nudes of the main character to pump their meme-coin.
Will EA sell me Need for Speed Underground 2? Nope! They won't even acknowledge it exists on their website:
https://www.ea.com/games/need-for-speed
Just look under the "Need for Speed Games" menu.
I think this is what makes movie piracy a lot less romanticized. For the most part, Universal Studios is willing to sell me an old movie for a fair price. It's mostly the software and especially the game industry that is hostile to this idea.
I think copyright law should be modified to have more consideration for the rights holder's commercial abandonment. I would change it to add these parameters:
If a copyrighted work was sold to the general public at any point, and the rights-holder no longer sells that product in a way that a reasonable person would purchase and consume that work or is no longer for sale in a manner consistent with its original form of sale, people are then free to copy and redistribute that work for non-commercial purposes, although they may collect donations for the purposes of covering distribution cost so long as they don't make those donations a prerequisite for the end consumer's access of the copyrighted work.
So I can go to the store and buy any of these? No? Huh. Sounds like this is largely untrue for most films ever produced commercially.
https://en.wikipedia.org/wiki/List_of_Universal_Pictures_fil...
https://en.wikipedia.org/wiki/Public_domain_in_the_United_St...
But sure, let's go to more modern examples. Are all of these easily acquired "new" these days?
https://en.wikipedia.org/wiki/List_of_Universal_Pictures_fil...
With movies more so than with games, the piracy scene and the organized/commercalized bootleg scene were never far apart. Few people sit in a cinema with a camcorder "for the love of it", while many people will do the same thing for a few hundred bucks.