Try it!

See the picture below? It's called demo.jpg.

Right-click on it, select "properties" and check: demo.jpg, right?

So now: take a closer look at demo.jpg. Click here, or type it into the title bar. (On Firefox, you can even "View image".) Notice any difference?

But it's the same file, isn't it?

What is DeLeach?

Deleach is a unique program which protects your website and your server from a whole range of unauthorised accesses. It is the first, fully-integrated, deep-linking controller.

Using DeLeach you can:

Take control of bandwidth theft. If other websites are trying to deep-link your resources, you can bandwidth-limit them, superimpose your advertising and credits, or shut them out altogether.
Create automatic gateway pages. You can establish welcome pages, legal notices, and data-collectors which work on every page on your site - even if your visitors are following deep-links.
Eliminate browser compatibility problems. No longer do you have to craft complex cross-browser kludges. DeLeach will automatically select specialised versions of CSS files, scripts, and objects to give each browser exactly what it needs.
Protect your premium content. DeLeach can validate the identity of visitors to your site, and serve premium content only to authorised users. Your customers don't even need a password!

... and more!

How does it work?

At its simplest, a website is just a collection of files. A program - your browser - asks a website for a file name, the website serves up the file content, and the browser displays it. Every time the browser asks for the same file name, the same file content is returned.

And there's the problem. You're not in control of what data your website is sending out into the world - the world is. Your webserver is working for everyone with a computer, serving up your files to anyone who asks, whether you like it or not.

So, what does DeLeach do that's different?

DeLeach looks at every request coming into your website, and instead of serving up the same file content each time it is requested, it can divert the request to a different file in a different directory. This way, even though the requests are the same, DeLeach can serve up entirely different content each time - or even no content at all.

DeLeach looks at:

who is asking,
why they're asking,
what they're asking for, and
what they're going to do with it

to determine exactly how to answer. As these factors change, your files - or even your whole website - can appear entirely different to different people at different times.

Why is that different from scripting?

There are technologies, such as scripting languages and CGI, which can modify the contents of the file as it is returned. But scripting can't do everything:

Firstly, scripting only applies to certain types of file (ASP, php, whatever). It doesn't apply to simple HTML files, to images, to media streams, and so on. DeLeach can control every file on your website, independently, if you want.
Secondly, although scripts can modify the content of files, they can't fundamentally change the nature of the files they return. A catalogue page will always be a catalogue page - it can't turn into a legal document or a video stream. That's becasue scripts only work on the pages they're working in - they don't take a birds-eye view of the website the way DeLeach does.
Finally, scripting can be inefficient. As your website becomes more complex, you find you need to build more different cases into your script files, and you have a tougher job keeping them synchronised. Your website becomes bigger, slower, more complex, more expensive, and more fragile with each new addition. But DeLeach handles all that for you - it won't even allow a script to run until you know you need it!

In fact, DeLeach doesn't replace scripting, it works alongside it. Your payment pages, your customer account pages, and so on will still be scripted conventionally. But DeLeach will be able to prevent those scripted pages even being activated if they're being requested from an unauthorised source.

So: DeLeach oversees the whole website, and yet can control access to every individual file.

Sounds impressive. Isn't it complicated?

No, not really. It's all done with "policies".

First, you define a set of policies - the rules which give different people different kinds of access. Then you break your site down into little, mini, websites, based on these policies. DeLeach then puts these fragments back together again to make a website.

So, for example, you can create policies such as:

_self: files requested from within your website,
_friend: files requested from within a group of websites,

_blacklist: files requested from known IP addresses
_vpn: files requested from within your own intranet or vpn

_robot: files requested by search-engine spiders,
_msie: files requested by Microsoft's Internet Explorer,

and you can create mini-websites - as much or as little as you want - around each one.

How can I try it out?

You can download it, from here. The entry-level version is free to use, forever.