Hi Domino and Patrick...
Here is the "official" reply from SongWritingFever.com...
when I was creating my account here, I was asked for my real name, with the reason being given that it would be used for copyright purposes. I'm fairly certain that would indicate that yes, your work would be legally considered yours.
I have to comment on this since the word "legally" means very different things in different countries and under different laws. SongWritingFever.com makes no claim whatsoever that by uploading your music or submitting your lyrics to SongWritingFever.com, you have legally proved the work is yours as far as the law in your area is concerned or that the work is registered for copyright.
SongWritingFever.com will always strive to support any fair copyright claim if there is ever a dispute (which hasn't happened so far). This is the reason why we ask for your real name, if you were registered by your nickname, SongWritingFever.com can only attribute the work to this "nickname". However, the weight that information provided by SongWritingFever.com carries in any court is completely NOT the responsibility of SongWritingFever.com and SongWritingFever.com makes no claims about this matter whatsoever.
In the olden days, when someone wanted to make an official record of their work being theirs, without officially obtaining a copyright notice--the price for getting a notice kept going up and up--they would mail a copy of their work to themselves.
This is absolutely true...and it's a common practice to mail stuff to yourself. To what extent any given court gives merit to such documentation (SongWritingFever.com, any other website, or mailing stuff) is a matter you should ask a lawyer about.
Meaning, if someone were to try and use my song without my authorization could I then sue that individual?
you really can never be sure that your lyrics will not get stolen! However, in over 5 years of moderating SongWriting Fever Yahoo! group and 2 years working on this website I've never seen a case where someone's lyrics were stolen....I really believe almost all people in such communities are honest and act in good faith. Thieves do not stand a chance because they are by definition unaccomplished folks who wouldn't know what to do with the work they stole anyways. It helps when you protect your songs via official copyright.
That being said, to fully protect yourself (meaning to protect your rights to your work in a court of law), you might need to formally copyright your song or lyrics with your country's copyrights office according to the laws in your area. In USA, this is a very easy process, just visit copyright.gov
Finally, I would recommend you read our copyright and license tips
..and of course let me know if you have any more questions