Looking for a module that can allow a "one-time download" type behavior. Akin to the one-time login, I would like something that allows me to send out a link that will allow a specific file to be downloaded once, with a (possibly optional--not dead set on that) expiration date (ie: if it's not downloaded before the expiration, it can't be downloaded anymore). Something that can be integrated into an automated workflow would be ideal, but I'd be happy even with something that requires manual setup.
I've tried looking through the module directory already, but there are so many potential hits that it's hard to isolate what might be useful; can anyone direct me to something?
Currently using Drupal 6.x, but do plan to upgrade the site to Drupal 7.x, so modules for either one are welcome for consideration.