Rockstar revealed the cheats codes for the game but just like with GTA IV activating them will disable achievements and trophies.
http://www.egmnow.com/articles/news/...eats-revealed/
For those who stream footage of the game on Youtube, Rockstar has stated they don't really mind what you show off although since the game just released, they will go after everyone who deliberately spoils the ending this early.
Quote:
Spoilers: Posting video showing the ending of the game, pure cutscenes or any other big reveal in the story. It’s ok to show cutscenes as part of a larger play-through (or in a narrated ‘Let’s Play’ type video) but isolated videos of the game’s cinematics will be removed. If you are unsure if what you want to post is considered a spoiler, please contact copyright@take2games.com and describe exactly what scene you are wondering about and in what context the scene would appear
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http://www.egmnow.com/articles/news/...outube-policy/