Teamviewer encrypts everything that you do with it. They don’t detect abuses of the free license based on content, but they utilize public information about networks that connect two “free” users to identify commercial use. For example, say you help your mom with her computer problems using your free team viewer account. All is well when you do it from home, but if you go to Starbucks and connect that use gets flagged as a commercial use. Subsequently, your account (your TeamViewer ID number) will show a countdown to “trial expiration.” It will ask you to purchase a license.

You can call TeamViewer customer service and ask for it to be reset. They will examine the log of your connections, verify that your use was not commercial and reset it.
If you join the FDPA TeamVewer account as a user you (actually your device) becomes associated with a commercial license and you can’t use that machine with a free account anymore. Teamviewer suggests a workaround: do all your commercial support from a single device, say your desktop computer. Do your free TeamViewer connections with a different computer device (laptop, tablet, etc.) That way you get the best of both worlds. If you stop volunteering with FDPA tech support, be sure your registration on the commercial account is removed and contact TeamViewer to get your free account reinstated as a non-commercial user.
If this sound like too much hassle, there are a ton of free screen sharing options available with many if not all the same features as TeamViewer. Zoom is rising in popularity. “Jump” is another. And Windows has one built in for fellow Windows users.
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