Gaming Laboratories International (GLI) is a company that tests and certifies online gambling systems, including online casinos, poker rooms, bingo games, and sports books. They have more than a dozen offices worldwide that provide independent testing for the regions in which they are located. GLI's certificates of integrity and seals of approval are highly regarded; to even be considered for testing, the licensee needs to supply Gaming Laboratories International with all of their hardware and software used for random number generation (RNG) and a submission letter. Submission Letter Requirements

The submission letter has to be very specific, especially in regards to the RNG software. The information that must be included in the letter is as follows:

- Game parameters and rules. This includes the number of selections
within one game or draw, the range of those selections, and whether or not the numbers are replaced after they were drawn.
- A description of the RNG. This includes the seeding method, the frequency and size of the seed, the type of RNG algorithm used and the algorithm's location within the software.
- An explanation of any differences between how the data is drawn during testing and how it is drawn in the final product. The final product must be as close to the final product as possible, including the use of functions, calls, variables, and scaling.
- The program's current software version(s) and the hardware requirements to run the software.
- If the program has previously been submitted to GLI, a list of changes that have been made since the last submission.
- GLI Verify signatures or equivalent.
- Billing expectations and information.
- Intended RNG report recipients.
- Primary contact(s) and contact information.

Gaming Laboratories International is one of the most well respected online gaming testing companies. If an online casino company wants to be considered for licensure by GLI, they must put a significant amount of time and effort into their submission letter. The trust that the online casinos gain with GLI approval is enough to make the time investment worthwhile.