License violation in OpenAdStream

[Jedi/Sector One]

  Hello.
  
  OpenAdStream (http://www.realmedia.com/) is a popular, but closed-source
commercial software designed to serve web ads.

  The heart of the product is an Apache module called mod_oas.so.
  
  Here's what a "strings" command reveals on that module :
  
# strings mod_oas.so|fgrep GNU
GNU Rx version 0.07.2

  GNU Rx is released as a GPL product, not LGPL.
  
  Isn't this product a violation of the GNU license?

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