The point is to not mislead people. When you write "buy," you are implying that the "buy"er is obtaining a perpetual right to use the software, subject to certa

The point is to not mislead people. When you write "buy," you are implying that the "buy"er is obtaining a perpetual right to use the software, subject to certain rules (i.e. you can't make copies and redistribute it). "Buy" implies the buyer has an absolute right. When "buy" actually means a temporary revocable license is issued, and the buyer has no rights, that's a problem.