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This means the Documentum URL you typed contains errors. Be sure it has the correct format (dctm://server:port/docbase/cabinet/folder).

How does Group Expansion Work?

1. Download all ACLs
2. Fetch $groups the $user is member of.
3. For each ACL
   1. Check if $user is the file owner and dm_owner has at least BROWSE permit.

      If so, return with user has read access.

   2. Check if $user belongs in all groups specified in "required groups".

      If not, return with user has no read access.

   3. Check if at least one group from $groups is on "required groups set":

      If not, return with user has no read access.

   4. For each deny:

      If one deny entry matches $user or one group in $groups, return with user has no read access.

   5. For each allow:

      If at least one entry matches $user or one group in $groups, return with user has read access.

   6. If up until now the user has read access, and dm_world has at least BROWSE permit, return user has read access.

Note:

• If user has read access, then we add the ACL ID as a group name.
• If user is owner and dm_owner has BROWSE permit or higher, the user is added as group name.

Specific Documentum document level security examples can be found here 

General 

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