Digital Signage without Servers

Hi - I work within an extremely large international company that has a flat worldwide IT service.  Security is extremely tight and I've yet to find a digital signage system that will pass a security scan.  What I need is a system that does not use web servers or iClouds.  Cannot be a subscription service.  Allows multiple accounts with users/passwords.  Should not be a Windows based system.  Content update-able via local network/domain.

Does such a system exist?

Thanks
Bob
Robert SchumannFacilities PlannerAsked:
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David Johnson, CD, MVPOwnerCommented:
Are you referring to a Certificate Authority?
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gheistCommented:
If you estabilish server digital signatures (like SSL) , you need at least CRL server.
GnuPG/PGP will be serverless, but then you need trustee on trustee on trustee to sign new keys (and still LDAP server is recommended, AD works fine)
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Robert SchumannFacilities PlannerAuthor Commented:
Thank you
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