Possible Duplicate:What is duplicate content and how can I avoid being penalized for it on my site? I have internal pages that rely on an external API which I would like to build upon user request. Two options I thought about:  Make lots of 'thin' pages that specifies that if you want content about X, you need to log-in, and then the page will be built. Pros: user understands what he'll get when logging in. Cons: SEO implications of such a solution due to the mass 'low quality' and 'cross-sites duplicate content'Make them all redirect to ONE same generic log-in page. Pros: No duplicate low quality content. Cons: Lots of internal links to the same log-in page. Which would you recommend?
Can mass different log-in pages result in SEO duplicate and/or low quality punishments?
seo;google;duplicate content
I would personally go with option 2.  The test cases behind option 1 seem like they will become unmanageable in the near future as more and more login pages are created.