Erik Moeller writes
Yes, you can use Wikipedia articles. They are licensed under the GNU Free Documentation License, which mainly means that articles that use them also have to be FDL-licensed. Note that the FDL does not mean that you "lose" your copyrights, only that others will be able to copy and modify the so- licensed text. We consider this fair:
Not all of us, as fighting against intellectual property rights using the tools of intellectual property strikes some as hypocritical.
Robert has of course the option to use for his translation tutorial only those Wikipedia texts that have been released into the public domain,
Are there any? I know that you release all of your contris into the public domain, but once someone else starts working on them, they become FDL licensed.
Regards,
Erik