I'm sure anyone was surprised with the question, and what is basically a statement as a cathedral: We can not publish everything on the internet. And why?

The majority of Internet content that runs, has an owner. Like this blog are mine, and your blog is yours, files, images, text, music ... also tend to have an owner. This is not always the owner who hangs on the Internet, but rather who has created or has been appropriate to use, and other banda is the owner who decided to use.

So we are a bit complicated thing. How do I know who the owner of an image? How can I find a picture if I can use? And what if I take an image and transform, happens to be mine?

You must know that there are licenses. Of these there are as many as you like. Many of them custom made, and other standard. Getting here can not explain all the licenses that invented the Web, explain that you will be fine to play content legally.

Creative Commons. This is one of the licenses you need to trust and the strength that you can find documentation in Catalan: http://cat.creativecommons.org

This license s'en derived from six different. These are subject to a combination of four characteristics:

Recognition (Attribution): In any exploitation of the work authorized by the license must reonèixer authorship.

Noncommercial (Non commercial) exploitation of the work is limited to noncommercial uses.

No derivative works (not Derivate Works): The authorization to exploit the work does not include the transformation Crerar Auna derivative.

Share Alike (Share Alike): The exploitation inlcou authorized the creation of derivative works as long as they keep the same license to be disclosed.

These logos will help you know the details of each license and therefore learn usage. I'm sure the film made from Creative Commons helps you understand: