Bsd updating software
Copyright is a law that restricts the right to use, modify, and share creative works without the permission of the copyright holder.
When an author releases a program under a copyleft license, he makes a claim on the copyright of the work and issues a statement that other people have the right to use, modify, and share the work as long as the reciprocity obligation is maintained.
It also introduced a disclaimer about views and opinions expressed in the software to be those of the authors and not of the Free BSD project.
The modified BSD License or the 3-clause BSD License was formed by removing the advertising clause from the original BSD License.
Further, the Free BSD version or the 2-clause BSD License was formed by removing the non-endorsement clause from the modified BSD License or the 3-clause BSD License.
The BSD License lets you freely modify and distribute your software’s code in the source or binary format as long as you retain a copy of the copyright notice, list of conditions, and the disclaimer.
The original BSD License or the 4-clause BSD License also contains an advertising clause and a non-endorsement clause (detailed explanation about these clauses are offered in the following questions).