onewolf

I purchased SM 2014 USA earlier today, and installed it on two laptop comuters in my home. When I attempted to install it on a third laptop, I am told I need a different product key. Is it necessary to re-purchase the program, to use it on a third computer? If I remove the program from either computer #1, or computer #2, will I be able to install it on computer #3, without purchasing another copy of the software? Thank you for your help.