Is sublime legal to use?

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http://askubuntu.com – I use sublime as my primary text editor. I installed it using this ppa sudo add-apt-repository ppa:webupd8team/sublime-text-2 sudo apt-get update sudo apt-get install sublime-text After I use if for a while, when I try to save any unsaved work i get an warning saying "This is unregistered evaluation version" When I click "Cancel" on the dialog box. It allows me to continue using. So is it okay to use the unlimited trial version? Need advice from AskUbuntu experts. Thanks (HowTos)