Answer / pavan kumar

You dont provide security in Report Studio. You will
provide security in cognos connection, you need to select
the report, goto properties, permissions and here you need
to add a user or a group that will access this report. You
can also define the kind of access they will have on this
report (ex: read or write). If you provide write access,
the other user will be able to modify the report in report
studio.

Also, when a report is saved in a package or a folder by
default it will inherit the security of the parent
folder/package.

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