I am betting that it's tied to the profile. I'm not 100% guaranteeing that but since the game is including a weapon storage that will be shared across characters on a profile, I am guessing that is how it's going to be.
You should place your genitals between your toilet and the seat and then just slam the seat up and down repeatedly.
I share all my extra content with my wife, and from my experience almost all DLC goes like this:
On the FIRST system it is downloaded on, ANY profile on that system can use the content at ANY time. (This would be my wife's system, using my profile)
On any SUBSEQUENT systems it is downloaded on, only the ORIGINAL profile that downloaded the content can access it, and ONLY when that system is connected to the internet. (This would be my system)
So yeah you guy's shouldn't have any problem if you're using the same console.
EDIT for clarification: This has worked on every single online pass I've done so far (which is pretty much what the PC is) including Saints Row, ME3 collecters edition, and all the GOW/Halo stuff.
I can also confirm this works for all DLC I've ever downloaded.
It works for every profile on the system it's originally downloaded on, but if you sign into another system (with the profile that downloaded it), it will only work for THAT profile ... unless you do a system transfer or whatever MS/XBL calls it, where they transfer all your licenses and such to a different X-Box.
Matthew 5:5 - Blessed are the geeks, for they shall inherit Middlearth. You think you have lag? It took Jesus three days to respawn!
I believe its only good on whatever profile you type the code into. With DLC most of the time my friends could play them, but these clubs are exclusive to one profile only. With Modern Warfare 3 my friend could plan splitscreen with me and play the DLC I had, but only I had the Elite club thing.
GFAQS - Land where your opinion is what everyone else says it is.