joshfire/jsonform — pull request #74 by luizgpsantos (2013-08-19 19:13:36+00:00)
Title: Now the readonly property of fields is read from schemaElement. JsonSche...

JSON Schema already supports a property called `readonly`.
We should be looking to change a field to read-only by looking the schema and not the form-customization.

Here is where the JSON Schema spec define the property:
http://json-schema.org/latest/json-schema-hypermedia.html#anchor15