Several questions about legality of putting guns into your game

True and almost word for word EA’s argument.

Being right or wrong is not the reason why such actions occurs in the first place but rather silence and inaction are considered acceptance.

http://www.legalmatch.com/law-library/article/silence-as-acceptance-in-contracts.html

If the interest group does not respond then under civil law such use like branded weapons in a video game would be considered an agreement and a winnable defense and considered binding.

So back to the OP.

  1. Watch this.
    Trello

If it makes it to market you just got some free legal advice.

  1. Not a good idea as I stated silence is considered acceptance so best practice requires the company to respond.
  2. Most likely you will receive a cease and desist notice.

In most cases companies are not bad guys but are just out to protect their best interest as you would having your interests protected. You would not be a happy person if someone used your stuff thinking it’s their right to do so and if you don’t say anything then it’s considered acceptance.