SGFC is the reference implementation for the SGF FF standard.
It's a command line tool for checking SGF files for correctness and correcting any errors. It also converts FF-FF files to FF.
SGFC is intended to be a tool for SGF experts, coders and maintainers of large SGF archives. You ought to have quite some knowledge of SGF to use SGFC efficiently.
SGFC was written primarily for Go/WeiQi/Baduk (GM) files. It can't handle other games yet, i.e. it doesn't check any game-specific properties and values of other games than Go. It may even save errornous game-specific properties of other games! Use SGFC for other games with care.
These details are provided for information only. No information here is legal advice and should not be used as such.