Is scraping a website allowed?

Is it okay to scrape a website for data?

It seems to me that if the data is publically available and even the source code for the page is visible through the View Source option, that scraping the website is also allowed.  But I need to hear what others think about this first.

What could the website do to block scraping?  Legally?  Technically?  

Would they need to block so that View Source fails?  Is that even possible?

I'm curious...

Thanks,
newbieweb

newbiewebSr. Software EngineerAsked:
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mattibuttCommented:
even if you scrap the website google cache the website and its available if is no longer coming from you. blocking view-source is not possible with html.
if you are using java applet or flash then it will not be visible there are some other applications. there are techniques to disable browser saving file locally but then you are suppose to program  this for every single browser exists.
the source of website if written in server side will never be visible on the browser for instance if you used java servlet, php, .net or ruby nothing will ever be avilable publicy unless someone hacks into the webserver i am still confuse what are you trying to acheive
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ghemstromCommented:
The webpage with its supporting data is protected by the publisher's copyright, which implies that you could read it but not republish it without the publishers consent. Even the linking to his page should not be done without consent if it is not evident that it is allowed...
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newbiewebSr. Software EngineerAuthor Commented:
I am not trying to block my website from scraping, I am trying to find if it's allowed for me to scrape other websites.  Websites exist with data I want to import.

I wonder if that is allowed, and if it's possible just by reading the HTML.
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mattibuttCommented:
you need author permission perior to using their content if they have forbidden the use of their content if not you can use it
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ghemstromCommented:
I would say that you must have a permission if the permission is not explicitely given on the webpage.
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newbiewebSr. Software EngineerAuthor Commented:
Thanks.
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