Download Class 12 Computer Science Concept Summaries: CBSE Class 12 Computer Science Free And Open Source Software Notes
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Chapter-1
FREE AND OPEN SOURCE SOFTWARE
Free Software
Definition by Richard Stallman’s:
It means software is freely accessible, free to use, changed, improved, copied, distributed without any
payments.
Four kinds of freedom
► Freedom to run the program for any purpose
► Freedom to redistribute copies.
► Freedom to study how the program works
► Freedom to improve the program and release your improvements to the public.
Open Source Software
Definition: The categories of software / programs whose
licenses do not impose much conditions.
Features:
1. Freedom to run and use the software
2. Modify the program
3. Redistribute copies of either original or modified program (without paying royalties to previous
developers).
It can be freely used for modifications, but it does not have to be free of charge. Its source code is
available.
Criteria for the distribution of open source software
1. Free distribution
2. Source code
3. Derived works
4. Integrity of the Author’s Source code
5. No discrimination against fields of endeavor.
6. Distribution of License
7. License must not be specific to a product
8. License must not restrict other software
FOSS (free and open software)
Free software- no payments
Open source software- for technical progress
OSS and FLOSS
► OSS- Source code is available
(open source modified and redistributed software) free of cost or with nominal charge.
► FLOSS- (free libre and open source software)
FSF( free software foundation)
Founded by Richard Stallman in 1985 to support GNU project.
Non-profit organization created for the purpose of supporting free software movement
GNU (free and open source)
Objective : To create a system compatible to unix but not identical with it.
Now it offers a wide range of software, including applications apart from operating system. Proprietary software (neither open nor freely available)
Definition-
Its use is regulated and further distribution and modification is either forbidden or requires special permission by the supplier
Source code is not available.
Freeware
►
Free of cost
► Copying and further distribution but not modification.
► Source code is not available
► Eg. MS IE
Shareware
► Right to redistribute copies
► After a certain period of time license fee should be paid.
► Source code is not available.
► Modifications is not possible.
Objective- to increase user’s will to pay for the software. Limits functionality after a trial period of 1-3
months.
Some Softwares
LINUX
► Linux: - free and open source software.
► It can be downloaded from www.linux.org
► Linux is a part of popular webserver program LAMP (Linux,apache,MySql, PHP).
Mozilla
► Freeware
► No source code available
► free internet software
It can be download from www.mozilla.org
Apache Server
► Apache HTTP server is an open source web server.
► It is component of LAMP.
It can be downloaded from www.apache.org
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Study Material and Revision Notes for Class 12 Computer Science Free And Open Source Software
Quick Revision Notes: Free And Open Source Software (CBSE)
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FAQs
You can download the teacher prepared revision notes for CBSE Class 12 Computer Science Free And Open Source Software Notes from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Class 12 students get the best study material for Computer Science.
Yes, our CBSE Class 12 Computer Science Free And Open Source Software Notes include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Computer Science principles which is important for getting more marks in 2026 CBSE exams.
Yes, our CBSE Class 12 Computer Science Free And Open Source Software Notes provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 12 is covered.
These notes for Computer Science are organized into bullet points and easy-to-read charts. By using CBSE Class 12 Computer Science Free And Open Source Software Notes, Class 12 students fast revise formulas, key definitions before the exams.
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