Allah, may He be exalted, has guided me and enabled me to erase the unlicensed software that was on my computer, but if Allah blesses me with a job on the computer, or I am asked to do some work on a computer that is not mine, do I have to make sure that the software used is licensed, or not? Is there any sin on me if I work on that computer when I know that the software is not licensed?

Praise
be to Allah

It is well-known
that copyright, patents and other rights of a tangible or intangible nature
are protected, and it is not permissible to transgress those rights or
tamper with them without the permission of the owners.

But if there is
a need for that software, and original copies are not available, or they are
available at an exorbitant cost, especially if the owners have already
covered their costs and made a reasonable profit, then in sha Allah there is
nothing wrong with copying them or downloading a copy of them, on condition
that it is for personal use only, whether this use is at an individual level
or at the level of a company that does not trade in this copied software.
This is a middle view between those who would ban it altogether and those
who would allow it in all cases, without restrictions. For more information
on that, please see the answers to questions no. 102352
and 81614.

Because the
issue is one on which the scholars differ, with some forbidding it and some
allowing it in different circumstances, you do not have to make an extra
effort to find out about that from the business owner. Even if we assume
that this software was set up on this computer in a situation in which it is
not permissible for someone like him to do that, the burden of sin is his
alone, and you do not have any share of his burden of sin, so long as you
are working with him in permissible activities and you are not the one who
set it up on the computer. Allah, may He be exalted, says (interpretation of
the meaning):

“And no
bearer of burdens will bear the burden of another”

[Faatir
35:18].

But if the
company makes money from copying and selling this software, then in this
case you would be helping them in this transgression; then you would be
required to stop, in compliance with the words of Allah, may He be exalted
(interpretation of the meaning):

“but do not
cooperate in sin and aggression”

[al-Maa’idah
5:2].

And Allah knows
best.