imunfair writes "Designing games we often prototype using placeholder models, such as those created by the Spore creature creator. Normally those models must be replaced — but Spore models created by the user would seem to be the property of that user. However, their EULA claims items you create are their property — to protect EA since they reuse your creations in their game.
Can they legally stop you from using these models in your own game? Are there other instances of content creation tools successfully restricting use of the content users create?"