A compressed file format, similar to mp3. Features slightly better quality at the same compression rate. See http://www.vorbis.com for library and sources.
Free, open source. Very liberal license. Can be used commercially without paying royalties.
A Remake is generally a newly programmed version of an existing (usually quite old) game. Remakes can be true to the original, but most tend to use improved graphics or enhance gameplay with new ideas.
There are several websites dedicated to making Remakes.(e.g. http://www.remakes.org)
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