In short: when you are a company with more than one developer, and you intend to work with our component(s) with more than one developer you need a Site license.
A site license grants you the following rights (see the License Agreement for more information):
SITE LICENSE: If you are using the Materials under the control of a Site license (or an unlimited-developer license), you may use the Materials with a Team of developers.
IT2BE will provide you with a license code key that enables the Materials for a Site license.
The Site license grants you the right to distribute the Redistributables as a part of your solution to an unlimited number of clients/sites without any additional runtime fees.
The Site license only grants you the right to expose the license code key and the API to members of the development team and only during development of your solution.
If you obtained a time-limited Trial license, the duration (time period) of your license and your ability to use the Materials is limited to the time period of the obtained license, which is controlled by the license key code for the Materials.
The Site license does not grant any individual to use and distribute any portion of the Materials other than in the manner provided above.