Free Software (Part 1)

Free software, according to the definition created by Free Software Foundation is any computer program that can be used, copied, studied and redistributed with some restrictions. The freedom of such guidelines is central to the concept, which is opposed to software proprietor's concept, but not to the software that is sold longing for profit (commercial software). The usual way of distribution of free software is to enclose to this a license of free software, and to turn the code source of the available program.

A software is considered as free when he/she assists to the four types of freedom for the users of the software defined by Free Software Foundation:
* The freedom to execute the program, for any purpose (freedom no. 0);
* The freedom of studying as the program works, and to adapt him/it for their needs (freedom no. 1). I access to the code-source is a prerequisite for this freedom;
* The freedom of redistributing, besides to sell, copies so that you can help to his/her close one (freedom no. 2);
* The freedom of modifying the program, and to liberate these modifications, so that the whole community benefits (freedom no. 3). I access to the code-source is a prerequisite for this freedom;

The freedom of executing the program means the freedom for any natural person type or juridical to use the software in how many machines he/she wants, in any type of system computacional, for any work type or activity, without any restriction imposed by the supplier.

The freedom of redistributing the compiled program, that is in binary format, necessarily includes the compulsory nature of making available their code-source. In case the software comes to be modified and the author of the modification wants to distribute him/it, gratuitously or no, it will also be obligatory the distribution of the code source of the modifications, since they come to integrate the program. It is not necessary the author's authorization or of the distributor of the software so that he can be redistributed, since the software licenses liberate allow like this him/it.

So that it is possible to study or to modify the software (for private use or to distribute) is necessary to have access to the code-source. Therefore the readiness of those files is prerequisite for the freedom of the software. Each license determines how it will be made the supply of the code source for typical distributions, as it is only the case of distributions in portable media with the binary codes concluded (without the source) already. In the case of the license GPL, the source should be made available at place from where can be accessed, or it should be given to the user, if requested, without additional (except transport and media) costs.

For those freedoms to be real, they should be irrevocable. In case the desenvolvedor of the software has the power to revoke the license, the software is not free.

Most of the free softwares is licensed through a license of free software, as to GNU GPL, the more acquaintance.

Author: - About the Author:
Luis miguel love software especially the POS Software system. Visit this at POS Software system and see the Pos Software

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