The present disclosure relates to systems, methods, and computer-readable media for utilizing a content access authorization system to determine user access control efficiently and flexibly for digital documents that are stored in different geographic regions. For instance, the content access authorization system can convert sensitive user information for digital documents stored in a first geographic region into a probabilistic data structure that does not include user information and share the probabilistic data structure with a second geographic region. The content access authorization system can then utilize the probabilistic data structure to efficiently pre-filter user document access control for digital documents requested by a user in the second geographic region that are stored in the first geographic region, which significantly saves on latency and computing resource usage by reducing the number of document control access queries needed to be made to the first geographic region.