Copyrights
From ScribbleWiki: StampDetective.com
As an open source and free resource, it is important that the copyrights of others are respected.
1. Do not use copyrighted information from print catalogs. (You may reference those catalog numbers on the trader pages for the purpose of buying and selling only)
2. Do not upload images of other people's stamps.
3. When in doubt, contact the potential copyright holder of the information you wish to post and ask for permission.