Sample Exam Questions

From the objective of OSS-DB Exam Silver
S1.1 General features of OSS-DB (License)

Sample Question


You want to incorporate PostgreSQL into a commercial system and sell it. Choose the most appropriate one from the following descriptions.

  1. PostgreSQL cannot be sold in commercial systems. Instead of shipping PostgreSQL with your system, it must be installed separately.

  2. If you have a written license agreement with the PostgreSQL global development team that owns the copyright in PostgreSQL, you can sell it according to that agreement.
  3. It can be sold on the condition that a certain amount based on the sales of the system is delivered to the PostgreSQL global development team.
  4. If the copyright notice is properly made, it can be sold.
  5. There are no restrictions on the use or sale of PostgreSQL, so you are free to sell it without any special precautions.

※This sample exam is different from those that appear in the actual OSS-DB Exam.

Answer and Explanation

While OSS is available for free, licenses vary, and some may not be suitable for enterprise use due to restrictions on commercial use or requirements to disclose source code, so caution is needed.

The PostgreSQL license is based on the BSD license and is described on the following page.

The key is the following part:
Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies.

In essence, with proper copyright notices, you can use it for commercial purposes and sell it without having to pay the developer for it. This copyright notice is common to licenses based on the BSD or MIT licenses.

Therefore, the correct answer is D.