Try:
Editor1.Setting["security:AllowUpload"]= false;
Editor1.Setting["security:AllowDelete"]= false;
Editor1.Setting["security:AllowCreateFolder"]= false;
Editor1.Setting["security:AllowDeleteFolder"]= false;
Editor1.Setting["security:AllowMove"]= false;
Editor1.Setting["security:AllowCopy"]= false;
Or modify the security policy file:
<security name="AllowUpload">
true</security>
<security name="AllowModify">
true</security>
<security name="AllowRename">true</security>
<security name="AllowDelete">true</security>
<security name="AllowCopy">true</security>
<security name="AllowMove">true</security> <!-- this is rename too -->
<security name="AllowCreateFolder">true</security>
<security name="AllowDeleteFolder">true</security>
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