Protecting EXE, PDF and SWF files from piracy

I am hoping others in the community have some experience with protecting their Captivate output (EXE and SWF files) from piracy.  We will be selling our eLearning products developed with Captivate through our online store and want to protect them against file sharing and other forms of piracy.  I have found several companies online offering DRM (digital rights management) and SAS (software activation services) that require users to enter a license key to use the products.  I am looking for any recommendations from users who have implemented these types of services.  What provider did you use and what issues did you encounter.  Any insights would be greatly appreciated!
Thanks,
Jason

Most of the tools I have seen are geared towards extracting
resources from swf's. I use one myself (eltima.com) for
"harvesting" manufacturers content for my motorcycle dealers. They
are authorized to use this content, but finding someone at Yamaha
of Kawasaki or any of the majors who even knows where to find these
resources is next to impossible. I have also used it to learn from
by viewing scripts, but as you say, at the end of the day, I think
the concepts and best practices are about the only thing worth
taking away from others efforts, not the code.
Unlocking a protected file can be done as well and I remember
using a product over a year ago to get at the scripts within an swf
(I wanted the URL's that pointed to media - it was legal for me to
do this). It ran from the command line and output the scripts.
There aren't too many of these types of programs to be found, but
they exist.
My personal opinion is that it's not worth the effort. My
java classes can be decompiled and if someone wants to go to that
trouble, more power to them. To my knowledge, there isn't anything
out there yet that is perfect for backwards engineering an swf into
an MXML file, but a competitor of FLASH Decompiler says that they
can decompile Adobe 9 PLAYER swf's. For what it's worth, I plan on
posting the majority of my code on my flexdev.org site once I get
it established.
For people who make components for sale, this could be an
issue of stolen revenue if the decompilers get sophisticated enough
to reverse engineer the swc into a usable MXML file. I would be
against anyone who stole code for this purpose, for sure.

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