I have been given verbal agreement by my employer to use an aspect of a project we are going to be working on here at the office as my Masters thesis project. However, the school wants some sort of formal notice from my employer indicating that I have their approval to use information such as logs files as part of the data analysis and that any algorithms developed while on the job will still be permitted to be released as part of the thesis.
How should I format a business letter to indicate that this agreement has been made? Obviously it doesn't need to be as formal as a formal research agreement; however, it does need to be formal enough to satisfy the thesis director.