If i submit my ideas, it's safe isn't it?? Like no one's gonna steal ideas?? 
Actually, it is almost guaranteed somebody is going to 'steal' your ideas....after all, this is the point of the site, to share your ideas with others so they can benefit from them.
The author does retain their rights to the piece and you always have full control over it, but if you are posting it here thinking somebody is going to simply read it and comment on it and not use it...you came to the wrong place.

The purpose of this site is to disseminate ideas and tools to anybody that needs them. The main goal is to provide plots, adventure hooks, weapons, characters, etc. for personal use of game masters or players. Because of this, submissions here must be made in the understanding that once submitted, the submission will be available for anybody to read and comment on. The intention of this site is for them to be used by anybody for private game use only and permission is granted to distribute these submissions in any way or form provided they are not used for profit and they retain the author's name and a link back to the original submission. The authors will retain their copyright so if you want to use anything, and you need permission, you need to contact the respective author.
http://www.strolen.com/level.phpI am no professional of legalese and I just made that up, but really, as long as it is for non-profit and an author and link are provided, it is free game.