How can I completely remove the License Information from the PC?

If you want to completely remove ReSharper license information from PC, you need to remove following registry keys:

• For ReSharper since 9.x: "HKEY_CURRENT_USER\Software\JetBrains\Shared\vAny" 
  
• For ReSharper prior 9.x: "HKEY_CURRENT_USER\Software\JetBrains\ReSharper\<R# version>\<VS version>\LicenseSettings"

Please make sure that you have all VS instances with ReSharper closed and ReSharper has been removed when doing this.