The domain name registration guideline impose the following restrictions: Domains can be registered by Bulgarian companies and organizations, or foreign companies that have registered branches or commercial representatives in Bulgaria. The domain name has to represent the company name or its abbreviation. In general any name can be used if it is first registered as a trade mark at the Bulgarian patent office.
Until mid-2006, the price was 50 USD for one-time registration plus 50 USD per year (total of 120 USD including VAT for the first year). For local standards this was a very high price and many Bulgarian sites are now registered under .com (esp -bg.com), .org, or .net domains, as the registration costs are significantly lower (8 to 12 USD per year) and less of a bureaucratic hassle.
From August 25, 2008, Register.BG simplified the procedures, allowing the registration of domain names in the .bg zone without providing documented grounds (trademarks, company names) for the name. Eventual disputes are to be solved via the newly established Arbitration committee.
Since September 18, 2006, Register.bg proposes new, third-level domains in the a.bg, b.bg, etc., subdomains (a Latin letter or a digit +.bg), lower cost (12€/year incl. VAT), with less restrictions and no dispute resolution. They are targeted mainly at private individuals.
The domain has been enabled with Domain Name System Security Extensions (DNSSEC) since October 2007.