Yes and they are:

The nameservers of the domain name must be located in Algeria

The domain name must be related to a trademark or company name

No

Trustee service is not available for this extension

No, .dz does not provide ID protection to the registrant of the domain

Yes they are such as generic names, offensive, misleading and names contrary to Algerian Law

Anyone can register it both individual and organization

.When it expires, it is given a Renewal Grace Period of 0-60 days in which you can renew the domain at its normal price. After this period, it then enters a 5 days Pending delete stage where the domain can not be renewed at any cost and you would need to wait till it becomes available for fresh registration where it is now made available to the general public for repurchase

.DZ Domain Names must:

1. Have minimum of 2 and a maximum of 24 characters;
2. Begin with a letter or a number and end with a letter or a number;
3. Use the English character set and may contain letters (i.e., a-z, A-Z),numbers (i.e. 0-9) and dashes (-) or a combination of these;
4. Neither begin with, nor  end with a dash;
5. Not contain a dash in the third and fourth positions (e.g. www.ab- -cd.dz); and
6. Not include a space (e.g. www.ab cd.dz).

Network Information Center.DZ manages this domain name extension

The maximum period for this domain registration is 5 Years.