A "screener disc" refers to a DVD or Blu-ray provided to reviewers or awards voters before a movie's official release. It allows them to watch and evaluate the film before deciding on its merits or selecting nominees/winners. Full definition
For this review, I had only a watermarked screener disc, which compresses the content of the final product to a single layer and is not remotely a good indicator of the actual quality. (dvdizzy.com)
Having only a compressed, watermarked DVD - R screener disc to go on, it's tough to say much here. (dvdizzy.com)
A great deal of this happens through the distribution of screener discs for major films, which are sent to people who belong to major voting bodies (guilds and critics» circles, plus Academy voters) to aid them in being able to watch everything and fill out their ballots. (vox.com)