You may use the 21 days trial version of Batch TIFF Resizer for the sole purpose of evaluation. If you decide to use the program beyond the 21 days or for any purposes apart from evaluation, you are required to purchase a license to the program. Each license entitles you to use the program on 1 computer. However, SOHO and Home user can install the program on up to 3 computers provided that the user is the same licensee.