OK - Now I am caught up. There is no key required to install the Basic LTI Module in either 1.9 or 2.0. You just install the tool and then you can plug in tools that support Basic LTI. Those tools will each give you a url/key/secret.
Here is a list of compliant tools and software:
There are not a lot of free tools yet. Mostly commercial companies have built tools (so far). If you want to play a bit, here is a test URL/Key/Secret:
Secret: secret
This way you can test the tool and see if it works.
Hope this helps.
/Chuck