This site is under construction and is both very incomplete and subject to change.
The current cannonical site for documentation is here.

Can I opt-out from usage-tracking after opting in?

If at some point after you opt-in or activate a license you wish to opt-out to stop sharing any further data in the background, follow these instructions:
* Plugins: Visit the _Plugins → Installed Plugins_ page and click the “Opt Out” link next to the plugin’s column.
* Themes: Visit the _Appearance → Themes_ page, open the theme details and click the “Opt Out” button at the theme’s actions footer.How to stop sharing plugins & themes data?

If you have opted-in to usage-tracking or activated a license key without turning off the plugins & themes tracking switch, all SDK versions after 2.3.2 allow you to easily opt-out from sharing updates of plugin & theme data by following the opt-out instructions in the section above. However, instead of totally opting out from Freemius, you can simply turn off the “Plugins & themes tracking” switch in the dialog box that will show up after clicking the “Opt Out” option. This way you maintain all the benefits and restrict privacy of the other products installed on your site.