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There are very few licences for Image Toolbox. Here are hints how to avoid using the toolbox and reserving a licence. Note, that toolbox licences are released only by quitting Matlab.
Function <tt>imread()</tt> usually (ever?) does not require Image Toolbox, but it for some file formats requires Java. (What formats?)
Image Toolbox function and workarounds
;imshow: Use <tt>image()</tt> instead. You may want to use <tt>image(..., 'CDataMapping', 'scaled')</tt>