The phrase "same code" refers to when two or more things have identical or unchanged instructions, rules, or guidelines to follow. It means they are doing things in the exact same way. Full definition
The law in question is vague enough that opponents claim opposite citing same code, but it's down to interpretation, and legal opinion was that it was proper and legal. (politics.stackexchange.com)
From what I know about licensing this should lock people out from using the exactly same code as closed source, but would they be able to «rewrite» the algorithm as closed source? (law.stackexchange.com)