In reply to Benny Powers.

Sharing is great, but in situations where the code is used on a production web site and the admin of the sites does not have access to software updates for a commercial plugin they are using that is a recipe for a security nightmare.

So while the GPL allows code to be shared like this it doesn't mean that using that code in a production environment is prudent from a site administration standpoint unless you have access to software updates.

From a security standpoint along, above everything else, you should purchase any commercial plugins you utilize and make sure you keep them updated when updates are released.