make readonly/disable tinymce textarea

Use the configuration parameter readonly

tinyMCE.init({
        ...
        theme : "advanced",
        readonly : 1
});

Here is a link to a demo.

Update:
What you can do to prevent users from editing content in your editor is to set the contenteditable attribute of the editors iframe body to false:

tinymce.activeEditor.getBody().setAttribute('contenteditable', false);

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