show export button only for specific categories in mir_rights

Description

Let us specify an x-attribute in http://www.mycore.org/classifications/mir_rights to tag categories which mark copyright protected content.
Example:

Environment

None

Assignee

Sebastian Hofmann

Reporter

Kathleen Neumann

Labels

None

URL

None

External issue ID

None

Components

Fix versions

Affects versions

Priority

Medium
Configure