I've discussed with the other moderators, and we've said it is best to make all the assets yourself, however it is ok for one or two scripts. For example copying an entire game framework wouldn't be allowed, but if you need a script for just textboxes then it would be fine. Sorry that there's quite a bit of interpretation but there's a big grey area for what you can and can't do. To summarise, basic scripts are fine but not an entire game framework. Hope this helps!