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Why are you releasing this under the GPL but hiding/encrypting the code? The whole point of the GPL is that the code isn't hidden.
How do we get the open code? Very few companies are going to trust a tool that handles sensitive information that is completely encrypted.
Not everyone is a fan of sourceforge's own repositories, and adminer does have links to the projects home page. See this: http://www.adminer.org/
Also, I'm not sure what compile tool is used, but it can be compiled, or not.
The code is fully open sourced, you can find it e.g. at GitHub or here at SourceForge. The single-file version is minified, not encrypted. The minifier is part of the project. You may not use it at all or build the minified version by yourself if you don't trust the distribution packages.