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My question is about copyrights, and using third party content in a monetized web page. How would services like stumbleupon embed other webpages using iframes to their website, and make an income of them? Is there any legal aspect to this?
In other words, simply, is there any sentence a website needs to insert into their TOS or such disclaimers before embedding third party content to prevent any legal issues?
Thank you.
I haven't been able to find the website, but I don't think it's illegal, as long as you don't claim it's your own content or overuse it. I fact, you could do better by stating that the content is take from the link.
You may want to read the following:
http://en.wikipedia.org/wiki/Copyright_aspects_of_hyperlinking_and_framing
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Below are examples of the page source from both sites. I am on chrome if that means anything. My Questions is, why do these two sites look so differently from each other? Why does Facebooks source look the way it does, paragraphs and paragraphs of code with no formatting compared to stack overflow where tags and elements are distinguishable from each other?
Does it serve a purpose for it to be shown the way it looks on facebooks website? I assume that's not how it was formatted in development but done that way after loading it to the site?
**Here is an example of Facebooks source code from the landing page**
**Here is an example of Stack Overflows source code from the landing page**
Not necessarily. Majority of the code is on the server side anyway so you can't see majority of the code for both websites. However, Facebook's code has been minified. This means the code has been scrunched together to take up less space so that the site will load faster.
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Like here on Stack Overflow, when one asks a question, that question is now a tag of some page, is a new page created inside the the server with the name of the a tag so that search engines can find it, how does this work?
If no pages are created, where is this data of all the tags kept?
I see for this very page, Stack overflow haas this facebook tag.
<meta name="og:description" content="Like here on stack over flow, when one asks a question, that question is ">
The data is stored in a database.
The pages are generated by having the HTTP server invoke a piece of software which examines the URL, fetches the appropriate data from the database, and outputs some HTML.
There are numerous ways to do this including psgi, FastCGI, CGI, and wsgi.
that information used when you post a link to this page to facebook. just try it and you will see the result.
details: http://ogp.me/
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Is it safe to embed a webpage inside another webpage with external origin.
User can also choose what webpages to embed, and it could be anything, valid webpage.
Can those webpages access my document? manipulate javascript and does it have some XSS vulnerabilities?
Generally I'm interesting if it is safe, or if there is a way to secure it.
They cannot access your document. You cannot access their documents either.
The only 'dangers' are:
Annoying popups
Annoying alerts()
Viruses (JavaScript exploits (example), Drive-by downloads)
I don't recommend doing it! Especially not if users can share their own included sites.
Even if the external sites do not contain viruses, these sites are (from a user's perspective) on your site and can affect your reputation.
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I have a site currently under development which I allow users to post comments. I want to know if there is a potential security issue if a user maliciously posts HTML elements. I know allowing javascript or CSS is dangerous, but what about HTML?
Yes, there are security issues like iframe as mentioned in the comments. OWASP has a very detailed page on dealing with 3rd party content here: https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet .
Various languages offer libraries to deal with this:
Rails: http://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html
PHP: http://htmlpurifier.org/comparison
Many different HTML elements can be used in malicious ways, though iframe and script are the worst. The safest solution is to allow a formatting-only language such as Markdown that can easily be used with most server-side languages.
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what is the best for design full icons and images sprite for big site.. before UI Development or after ?
I don't believe that this is programming-related for one second, however I'd suggest that the best time for designing the icons and images for a site would be the same time at which the UI is being designed, since the icons/images have to fit the general aesthetic of the site itself.
Obviously this is only the initial design (and don't be afraid to amend, revise, re-design later) but it seems a mistake to think of icons and UI separately as distinct entities, rather than...symbiotic, maybe?