As per
http://www.usfirst.org/roboticsprogr...before-kickoff
- R13 Software and mechanical/electrical designs created before Kickoff are only permitted if the source files (complete information sufficient to produce the design) are available publicly prior to Kickoff.
It does not mention a specific location that the files must be published to, so I presume that making it a public project on github/bitbucket is sufficient to fufill the rule. However, posting it on a random website that isn't password protected is probably sufficient to satisfy the letter of the rule too.
However, not posting it on ChiefDelphi or somewhere that FIRST teams frequent is arguably against the spirit of the rule, and where possible I think most people would recommend doing that anyways.