AdSense's Unacceptable Content Rejection - What is it?

It seems like this is the question everyone's asking right now. There are more and more of these rejection questions showing up in the AdSense Help forums, and most people seem uncertain about what this rejection means. For the most part,  Adsense isn't all that clear about what to do in order to correct this, and won't spell out precisely what the issue is.

In some cases, the unacceptable content is easy to spot when you compare the person's website against the AdSense Program Policies, but it isn't always as simple as that - particularly when English is not the publisher's native language.

Some of the reasons for unacceptable site content that we've been able to come up with in the forums are as follows:

1. - content that doesn't meet adsense policy (read the policies here: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=48182)
2. - content that doesn't meet the webmaster guidelines (http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=35769) Although the Webmaster Guidelines are listed as "guidelines", AdSense publishers are required to follow these guidelines, making them as important as the Adsense Program Policies. When you are applying to become a publisher, or when you are a publisher, the Webmaster Guidelines are no longer guidelines - they are a requirement, so you'll need to consider these as rules you must follow.
3. - content that isn't original (articles and content you didn't write). Since the inception of "Caffeine", AdSense has been systematically disabling blogs and websites with copied content, auto-written contents, contents of little to no value (re-purposed content from other websites), written content that doesn't make sense or reads as gibberish, and has been rejecting blogs and websites of this nature in the last few months. If you apply with a blog or website with contents such as this, be prepared to receive a rejection notice. What you need is original content that you've created yourself.
4. - no content, or very little content. AdSense requires each blog or website to contain sufficient content. If you have a blog with one or two posts, that's not going to be good enough for AdSense to approve. If your website has only one page, then you'll probably get rejected, unless it's a very big place with a LOT of original content.  If you apply with a site that has "no content", then your "content" is non-existent, which makes it unacceptable content.
5. - blank pages in your website. AdSense doesn't want to see your proposed website, or a website under development. They want your website to be complete, and easy to navigate. It shouldn't have a redirect for the domain URL (unless you've used a 301 redirect), it shouldn't have a frame on the URL that calls the website from another URL (it needs to be a direct URL), it shouldn't have links that don't work or are broken, and it shouldn't have links that lead to blank pages with no content, or with only "ipsum lorem" text. That's the latin text you often see on template pages when you purchase a template or get a free site template. That text is nothing but gibberish - it's meant as a place holder, and you need to replace that with your own text.
6. - copyright infringements (images or other contents you don't have permission to use). Adsense expects it's publishers to "go the extra mile" and create their own unique contents, including images. If you can't create your own images to use with your text (websites and blogs need text, not JUST images or videos), then they expect you to get permission from the image owner BEFORE you use the images, and you'll need to give credit to the image owner. Images specifically marked as being in the public domain don't require permission for use, but you do still need to have a site with mostly original contents, so using a site full of public domain images and nothing else is likely to get a rejection.
7. - a website that isn't six months old and doesn't have six months worth of original content. Adsense requires sites from many countries to be six months old before getting approval, and although we don't have a list of specific countries to point to, it appears that there are many more countries AdSense has added this requirement for.

While there may still be other reasons for unacceptable content, these are the most common ones we've come across. It's up to each publisher to ensure their content follows the guidelines and policies set out by AdSense and Webmaster Guidelines so if you receive this rejection, you'll need to spend some time going through your website or blog and digging through your content to find the areas you'll need to amend, remove, or add to.

If you have taken the time to study your site and the policies and still can't figure out what's wrong, then you can ask in the AdSense Help Forum to see if someone else can see the issues at hand, but it's really the publisher's responsibility to at least try to figure out the problems first. Help is always available, but learning how to decipher your site's problems will help you keep your account in good standing in the future.