Is it permissible to sell an internet café management program that was obtained for free from the internet, and what is the permissible profit margin when selling devices? Is it permissible to add a charge for effort (installation and work) to the price of the devices, and can the price of the free program be considered a charge for effort?

If the program's copyrights are reserved, it is not permissible to copy or download it except with the owner's permission; otherwise, it is an infringement on their rights, which are legally protected. However, if its rights are not reserved, then there is no harm in copying, downloading, or selling it.

There is no Sharia (definition)-prescribed limit for permissible profit. It is permissible to add a charge for effort to the computer's price, or to consider the program's price as a charge for effort if its sale is permissible, provided the buyer agrees and there is no lying or deception. However, this applies to the shop owner; as for the agent, the shop owner must authorize them to raise the price or specify a certain price for them and allow them to keep the excess.

It is not permissible to sell computer devices to an internet cafe that is known to allow access to pornographic websites, as this constitutes cooperation in sin and transgression.