OpenID vs. OAuth

What is really the difference between OpenID and oAuth? They look just the same to me.

Secure static media access in a Django site

I'm building a site where registered users can upload files. Those files are then served via Apache. Only users who are logged in should be able to access those files.

C# Validate a username and password against Active Directory?

How can I validate a username and password against Active Directory? I simply want to check if a username and password are correct.

How do you Require Login for Media Files in Django

I'm serving "sensitive" information in downloadable PDF's and Spreadsheets within a user registration section of a site.

Is Facebook an OpenID provider?

Is Facebook an OpenID provider? I know they are an OpenID supporter but do they allow people to authenticate with other sites via OpenID with their Facebook credentials?

HTTP authentication logout via PHP

What is the correct way to log out of HTTP authentication protected folder?

What authentication libraries for PHP are not attached to a framework and meet these requirements?

Whenever I Google things like "php authentication library" I continue to come up with a ton of results of authentication libraries designed for Code Igniter.

cURL equivalent in JAVA

I am tasked with writing an authentication component for an open source JAVA app. We have an in-house authentication widget that uses https. I have some example php code that accesses the widget which uses cURL to handle the transfer.

Android — How to programmatically log into website from a form

The app I am writing involves taking details from the user and using them to access their account on a website. I know how to take details from the user but I don't know how to use those details to log into the website. Does anyone know how I can input these details in the correct boxes? Thanks in advance