QuerySecurityCheck and SaveSecurityCheck are not actually supported in DevForce EF, so what you've found in the Developer's Guide is obsolete.
Depending on your needs, you can provide the same features using property interception (using the partial BeforeGet, AfterGet, BeforeSet, AfterSet methods in the generated classes), client-side events on the EntityManager such as Fetching and Saving, server-side interfaces IEntityServerFetching and IEntityServerSaving, and also Verification. There's currently an instructional unit on Verification, with more samples coming in future releases.