Does LiveCycle work on Macs? I can't get a PDF to open.

I have some PDFs from an e-learning course. I downloaded a bunch of them but they won't open. Reader asks for my LiveCycle credentials, I enter them, and then I get an error that says,

"There was an error opening this document. This file could not be opened."

I'm running Mac OS 10.6.7 and Adobe Reader 10.0.2. I had someone try to open the file using Reader 10 on Windows 7 and it opened flawlessly.

Is LiveCycle incompatible with Macs?