Why do some movies on Netflix say DVD only?
It means that you have to get it in the mail.. You can't watch it instantly.
Netflix pays for licensing of movies and television programming. Restrictions on how that content can be acquired determines what can and cannot be streamed vs. mail-only DVD media. It is much less expensive to stream content and Netflix is striving to deliver a streaming only service since many households can now support the requirements for 720p surround sound HD movies.