Source? I thought that they were all open curriculum and didn't even have a paid program. It's been a while since I looked at it, but I've recommended it to pe

Source? I thought that they were all open curriculum and didn't even have a paid program. It's been a while since I looked at it, but I've recommended it to people as one of the better sources of actually free content, and not just upsells, and would like to know if that's not the case anymore.