The following is the download link to the Access 2007 runtime:
http://www.microsoft.com/downloads/details.aspx?FamilyId=D9AE78D9-9DC6-4B38-9FA6-2C745A175AED&displaylang=enAs the page says there is not additional license, etc. The runtime allows a user to run an Access application, they just can't make any changes because the runtime doesn't contain the Access UI, just the parts that are necessary to display forms, and queries, and print reports. If the user has the runtime installed, they can use all of the above parts of your mdb or mde.