Comment 1 for bug 1080159

Quotation:
"GCR is a library for displaying certificates, and crypto UI, accessing key stores. It also provides the viewer for crypto files on the GNOME desktop. GCK is a library for accessing PKCS#11 modules like smart cards, in a (G)object oriented way."

It is a library, thus it has no regular man pages. To read further run command:
$ apt-cache show gcr
...or read here:
https://launchpad.net/ubuntu/+source/gcr

If you are still prompted for password, than probably you have version 3.6.2-0ubuntu2 which has some bugs - to check it, run command:
$ apt-cache policy gcr

This issue is already reported as bug #1188256 . To make it fixed faster, please mark bug #1188256 as affecting you, or click this link, and select this bug as affecting you: https://bugs.launchpad.net/ubuntu/+source/gcr/+bug/1188256/+affectsmetoo

After you do it, please close your bug report.