So, the license change. It happened. We lost some data. But what happened before that to try and save as much as we could? And what exactly did we lose?
First, a brief timeline:
- Many moons ago, the OSM Foundation voted to change our license from Creative Commons to the Open Database License. This actually happened before I knew that OSM existed.
- In order to make the change, permission had to be secured from everyone who had contributed map data to the database.
- Contributions from anyone who did not agree to the new terms had to be removed from the database.
- At the end of 2011 the board set April 1st, 2012 as a target date for the license switch. This turned out to be wildly optimistic but at least it was a concrete goal to shoot for instead of just an ongoing process with no end in sight.
- The process of removing non-relicensable data was done by a bot that went through the entire database in the 2nd half of June
- After a little more cleanup, the first ODbL planet file was finally delivered in September.
Contacting inactive mappersThe first priority was to contact undecided users to make them aware of the change and that they needed to log in and indicate a decision. There were several rounds of emails sent out from the foundation to undecided users, trying to get them to respond. In addition to the emails from the foundation, users actively contacted other people in their area to try and make them aware of the decision. Lastly, the foundation supplied the account email address of some of the accounts with the most map data to a small group of volunteers for more targeted contact.
The result of this contact effort can be seen in this graph that I have been presenting since the beginning of the process:
The green line corresponds to the scale on the left while the red line follows the scale on the right. Of those who responded, it was a 99.5% landslide in favor of re-licensing their data. You can see that the people who were opposed to the change were very quick to log in and enter their decision. The big bumps in the green line clearly show when the mass emails were being sent out by the foundation.