We actually have multiple patents that protect our proprietary format of encoding and providing full version games via download (no need for CD, and the ability to play before the FULL game download even finishes).  

Features and functionality of Exent’s software are protected by the following United States patents:

6,779,179

6,598,125

7,533,370

7,596,536

7,596,540

7,607,127

7,844,442

8,060,460

8,069,136

…

And the following international patents:

KR 1020087013180

…

Other patents are pending.