District of Columbia Amendment No. 1 to Registration Rights Agreement is a legal document that outlines the amendments made to the original agreement between Turn stone Systems, Inc. (the issuer) and the purchaser of securities. This amendment specifically pertains to transactions and agreements taking place within the District of Columbia jurisdiction. The purpose of District of Columbia Amendment No. 1 is to modify or supplement the terms and conditions of the original Registration Rights Agreement to better reflect the interests and needs of both Turn stone Systems, Inc. and the purchaser of the securities. It serves as a legally binding agreement that ensures the protection of the rights and obligations of all parties involved. The main parties involved in District of Columbia Amendment No. 1 are Turn stone Systems, Inc., the issuer of the securities, and the purchaser, who is registered as the owner of the securities. Other parties may also be included in the amendment, depending on the specific terms and conditions agreed upon. Keywords: District of Columbia, Amendment No. 1, Registration Rights Agreement, Turn stone Systems, Inc., purchaser, securities, legal document, amendments, jurisdiction, parties, terms and conditions. It's important to note that there may be different types of District of Columbia Amendment No. 1 to Registration Rights Agreement between Turn stone Systems, Inc. and purchaser. These variations could include different amendments or modifications, based on the specific needs or circumstances of Turn stone Systems, Inc. and the purchaser. However, without specific information regarding the unique types of amendments, it is difficult to provide exact names or details for these variations.