It's easy to become a member of the Lopez Music Center. Just fill in the form on the right and follow the instructions that will be emailed to you.
Once verified, you will have access to all free and purchase downloads. If you want physical media, find it on Amazon. Note that many of the composer's works are only available here in digital format.
In many cases, the composer will grant free performing rights for performances of his works. This is determined on a case-by-case basis. Performance parts for ensembles and orchestral works are also available here for rental.