[snuxoll]

Erm, what? If you have ANY contributors other than your core project team going from a restrictive to a more liberal license requires agreement from all of them, as they ALL have copyright somewhere in the project.

The opposite, going from something like MIT or BSD doesn't require ANYONE to be okay with it, the license permits it.

[bryanlarsen]

There's only one author, that's not the problem.

My point was, if he had released his code as MIT/BSD and then wanted to change it to GPL it would be fairly ineffective -- people could still use the old MIT/BSD version in their proprietary products.