Ask YC: Can a site copyright their Javascript source code?
I came across some code today that I wanted to see how it worked, and even though majority of it is open source, some of it is their own and is copyrighted.<p>Decided to check out their terms of use<p>"RECOMMENDED READING grants you a limited, personal, non-exclusive and non-transferable license to use and to display and to make one copy of the Materials and to use the services, this Site solely for your personal use. Except for the license set forth in the preceding sentence above, you acknowledge and agree that you have no right to modify, edit, copy(ok), reproduce(ok), create derivative works of, reverse engineer(didn't know that), alter, enhance (also didn't know that) or in any way exploit any of the Materials in any manner. This limited license terminates automatically, without notice to you, if you breach any of these Terms. Upon termination of this limited license, you agree to immediately destroy any downloaded or printed Materials. Except as stated herein, you acknowledge that you have no right, title or interest in or to this Site, any Materials."<p>This is Mixx terms of use. 
This question doesn't apply to them alone, but to all sites.I'm just wanted to know if copyrighting JS code is a normal thing.