Special Restriction on Unique ship?

[ssc]

Looking at the Wiki for Capital ships, there are 5 that listed as "Only Given Via Admin Only". 2 are not allowed, since I can understand the reasoning, the Clone Wars Era Star Destroyer and the Battlestar(2004 version) are extremely odd to see in Disco, the other 3 however, I never seen any of them in use. Are there any rules or requirements to own such vessels? Ive asked about the requirements, but never got a answer that was clear. Can someone clarify this?

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Alpha = Low Level Encryption|Bravo = High Level Encryption|Delta = Security Channel Encryption|Gamma = Heavy Encryption
Omega = Highly Strict Encryption: Access Squence Required