First of all, I'm sorry if somebody has posted this before. I can't shorten my question to a few words to search, but anyways, here is my question.

If I sign in to the game as a demo, then what will happen if I one day get an S1/S2/S3 license? Will the game automatically unlock itself? Also, can you sign out after you've signed in? Sorry, bit of a noob.

Also, im new to the forums. I may not know if there is a more appropriate place for this.

Not automatically - you would just need to hit "unlock" button (accessible via click on button that says Demo user [your user name]) in LFS menu,then your licence status will change,if you have still the same game password. If you have changed it,you will have to enter the new one. Otherwise - licence name will stay the same (if you upgrade the same account) and you'll get access to content accessible to your new licence.