[mccoyst]

I don't think that most people understand the GPL. Everybody understands the basic spirit of it, but there are lots of details spread throughout that huge document. The preamble is longer than many permissive licenses. .That there is a preamble at all speaks to the complexity. It's too much for a small group or individual without access to a lawyer, and I don't think people in these cases are going to use a license that they don't fully understand.

[hammersend]

I just took the time to read the GPL both versions 2 and 3. It is pretty cut and dry as far as licenses go. Do you have any actual evidence that small groups or individuals are having trouble understanding it to the extent that it would have a statistically significant impact on its uptake?