Can I give an app that I purchased in the Software Center to somebody else ? (And related questions.)
Solution 1:
It depends on the license of each app/magazine/song. For the programs and magazines you got through Software Center, the "More Info" page for each app or magazine will tell you the license that it is under (under the description and above the review section).
If it is under a proprietary license, you're rights to redistribute are in all likelihood severely limited (or non-existent). For many of the other licenses you might see there, see: https://creativecommons.org/licenses/ to find out the rights and responsibilities you have if you want to redistribute.