Content Locking Without Porn Or Copyrighted Stuff

I mean sure there's arcade sites, but the net's got about 6,000 of those most of them not locked up. I've thought about torrents with pw protected rars but I think it's too risky to post a link to your site in a readme for legal reasons... plus won't the aff company wonder why all your leads have no referrer?

Anyone out there making money with a gateway/content lock that doesn't fit in these categories? I don't expect anyone to spill their magic, but a bit of inspiration for a n00b would be nice

write a e-book. or re-write a ebook if you can't come up with something urself