Sell ​​”free” software? – PC for All

I’ve seen on such Tradera that it sold software on the disc or USB that really are free to download.

For example, OpenOffice

Is it legal to charge?

The seller’ve certainly done some “work” to yourself to download and burn to disc (which costs money ) or put on a USB (which also costs money). But the program itself is, after all, free.

Since I have a föjldfråga applicable OS.

For example, Linux’s also free to download.
It ought to be just that a program like OpenOffice?

Since we have such as Microsoft Windows.
where one can download the software free from Microsoft, if you have a valid license key.

The man downloading, is, after all “free” when one already has his license.

However, there is nothing that says you should immediately use it together with the license.
So if you then sell it to downloaded, burned to disc or USB, but its own license, in the sense that the purchaser will use its own license.
What then (for buyers / sellers)?