Like a lot of people, I had the FULL version of Acrobat X Pro installed on my system, and I asked my I.T. department to upgrade me to XI Pro, not realizing that LC would be secretly deleted from my system. Well, the state agency I work for purchased the FULL version of Acrobat XI Pro instead of the UPGRADE version, and when I submitted my case to get the free LC upgrade, it was denied by Adobe stating that since I didn't "upgrade" to Acrobat XI, I wasn't entitled to it. As usual, they didn't budge when I told them that they got more money out of my agency by purchasing full version, and not the upgrade version.
Adobe did send me my upgrade to LC, but I had to spend a decent amount of money following the upgrade path. And yes, my Acrobat X Pro, Acrobat XI Pro, and now LC software is absolutely legal.