add license information

[droundy]

Hello, I'd appreciate it if you'd add license and copyright information to the file (even if you just intend this for the public domain). I'd like to use this extension in my project, but it'll mean adding the source code to my own repository and I'd prefer to do that with a clear legal path, and in a way that gives you credit.

Thanks, and python-markdown-graphviz looks awesome!

[ssokolow]

GitHub themselves have written a very clear explanation of why a license is important:

http://choosealicense.com/no-license/

TL;DR: In most countries, not specifying a license means "you have no permission to do anything with this" and the only reason we're allowed to view and fork your repo is because you agreed to it as part of the GitHub terms of service.

If you click the Home link there, it'll give you a simple guide and, if you click one of the license links, it'll give you ultra-simple instructions for using the license.

[ssokolow]

...and now I just fixed a serious bug in your code that causes it to freeze if the output file is over a certain size and I'm not sure whether I can share the fix because, legally, you haven't given me permission to make changes.

[vi4m]

+1

[vi4m]

I think we should rewrite it somehow

[ssokolow]

I wouldn't be a good candidate, since I've seen the code, but it's not complicated. The main tricky part is getting familiar with the API for extending python-markdown.