You get a developer license, if you own a paid license. Developer licenses are for your testing systems only and you are not allowed to use such a license on a productive system.
An evaluation license is for evaluation purposes for a restricted number of days.
More details here: https://www.atlassian.com/licensing/purchase-licensing
@Thomas , Thank you for the reply.
I have an evaluation license and its for 30 days.
Does this evaluation license run like that of the paid license - i.e I get all the features of paid one in evaluation right for a certain period of time (30 days)?
If no, please let me know what Im loosing in JIRA ?
No, evaluation licenses are full licences with all features.
They are valid for 30 days and after that, you can't use your Jira installation anymore.
You can extend your evaluation up to 90 days as stated here: https://www.atlassian.com/licensing/purchase-licensing?_ga=1.51105505.990137362.1491466771#evaluations-1
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