my guess is:

a) Simply a Re-Compile with ads AND parasiteware (via Open Source)
And therefore remaining in Sync with future LW releases?

From the CNet link I provided:
Editor's note: This download includes additional applications that are bundled within the software's installer file, some of which may be provided by parties other than the developer of this download. These applications may deliver advertisements, collect information, overlay content or graphics on the Web site you are viewing, or modify your system settings. As with all downloads, CNET recommends that you pay close attention to the options presented to you during the installation process. Known third-party applications bundled with this download include SaveNow, n-Case, and UCmore. For more information, please read CNET News.com's report on bundled software
http://news.cnet.com/news/0-1005-200-6759036.html
you can remove most spyware with SpyBot Seek & Destroy P.S. (use at your own risk)