CAM is the first release and regarded as the worst one. If you're not patient enough to wait to watch a movie, but don't want to pay for a ticket on a cinema, probably this one is suitable and meets your need.
Usually, this code appears in movies that have just been released. If CAM appears on the file name, this means the movie has been recorded with a video camera right at the cinema. It has the lowest quality you can see on a movie.TS or Telesync for the next release. This one is a bit better of the CAM, but still it's not worth as a collection.
TS or Telesync is actually a copy, a bit more decent, because it uses the sound directly from the cinema source. The recording is made with a professional video camera, directly from the projection booth.SCR or Screener. Well, if you rush to watch a movie but have got no money in your pocket to go to the cinema, this one usually would be your good start.
Video quality is usually good, but contains a few surprises, not being processed to the final version. At some point you can be left with no sound or with a black and white image etc.R5 a short for Region 5, one more for you who want to watch a movie in a rush.
R5 Line is the final version of the movie, sold in region 5, meaning East Europe, part of India, Africa, North Korea and Mongolia. The only difference from the original DVD after which this copy has been made, is that the sound isn't probably the same.DVD-Rip, I don't wanna comment more on this one.
This is the final version of the movie, a copy from an original DVD. DVD-Rips are made because a DVD movie isn't always released in all regions. This way, pirates take care of simultaneous circulation of the movie, in all areas.WEB-DL
This is a movie or TV show downloaded via an on-line distribution website (web download), such as iTunes. The quality is quite good since they are not re-encoded. The video (H.264) and audio (AC3/AAC) streams are usually extracted from the iTunes file and then remuxed into a MKV container without sacrificing quality.BD-Rip, last but not least. This one is the release usually waited by they who love pirated movies. The best actually, as it's picture is in the best quality of all the other release before.
It's exactly the same thing as a DVD-Rip, just that it refers to Blu-ray disc.By the way, if you want to get more info on this topic, just go to the link posted above and there you'll see more reference links.