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Can you put permissions on files that are uploaded to S3?
Or if someone knows the guild/url to the file they can access it publicly?
If yes, what kind of permissions can we set?
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I believe you can also generate 'passwords' that are only valid for a certain period of time
Not passwords, but you can create links that expire on at a certain time: http://docs.amazonwebservices.com/AmazonS3/2006-03-01/index.html?RESTAuthentication.html
Permissions are implemented with a key mechanism. You can make content readable for everyone (no password) or require a password. You grant upload privileges by generating a keyed URI which you can limit to a maximum bandwidth.
Amazon FAQ about access
Amazon documentation on authentication and access control
As dcaunt states, query string authentication requires an expiration date.