Sometime we just copy and pest other's article which might be license under someone else. Sometime we do it as the Internet is not stable and nobody can assure that the article URL will be there in future.
Mr. Shahriar Tariq, Volunteer, Bangladesh Linux Users Alliance (http://linux.org.bd check our forum: http://forum.linux.org.bd) wrote some nice word regarding this topic.
Bellow is his writings: (Copy & Pest)
If you are using someone else article as a reference
1) Check the license, most open source related articles are licensed under open license (such as Creative commons)
2) if the article is not licensed it won't hurt to politly ask the author whether you can use it. most author won't mind giving permission since they wrote it to let people know the content in the first place
3) be sure to give due credit to the original author. If you are not aware who is the author at least mention where you have collected the article
If you find that someone else is using your article without proper credit
1) don't jump on and attack the person, keep your tone checked all the time, if you start heated argument its more probable other person is also gonna reply angrily
2) It may be the case that the person who is using your article without credit are actually not aware of licensing issue. Its not uncommon in Bangladesh, most people don't understand piracy then how come they will understand licensing issue? Make him/her understand licensing issue
3) if reminding them properly does not work then take it up to the concerned team, in case of forum talk to the moderators, in case of community website, the owner is the person you need to talk to, if its personal blog take it up to the hosting company (given they are reputed hosting company).
Simple solution is not it?
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Thanking you
Shahriar Tariq
Founding Member, Amigos Clothing
http://amigosclothing.com