Crossover images and Copyright
Before getting into the actual question, I must refer to laws concerning copyright. Granted, many works which might be involved include Japanese anime, American series, and so forth. As a simpler and quicker basis, I must defer to Title 17 of the United States Code, section 107 (Copyright Act of 1976):
Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include—
the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
the nature of the copyrighted work;
the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and
the effect of the use upon the potential market for or value of the copyrighted work.
Probably the most substantial issue is that the use of purpose, particularly as this is a Huntik-based wiki. Though use may qualify as being nonprofit, it does not fall under educational or informational as the fullness of the original copyrighted character (history, nature, etc) is rarely maintained.
Another issue is that the original portion of the work in relation to the copyrighted portion of the work becomes skewed towards the "copyrighted" side. In other words, there is less original content.
Similarly, using copyrighted characters from one company and combining it with portions of a media universe from another company gets dangerously close to copyright infringement. For this reason, many (but not all) fanon wikis prohibit "crossover" content. There are also particular companies which do not allow such "crossover fanon" (such policies DO affect Wikia).
At the moment, I am working on policy and copyright issues at the Huntik Wiki as well as some side templating at the MNW. With this in mind, it would be nice to have any input by March 10, 2013, so that I can work on this when I have time in my schedule.
However, I need some clear and specific reasons as to why many of these images should be allowed. If a legitimate rationale can be come up with for a specific image, then it may remain. Otherwise they will be permanently deleted for breaching copyright. Please note that rationales such as "because I want to use it" will NOT be upheld.
As pertains to articles, the same copyright issues are at work when it comes to non-Huntik characters, names, etc. Again, a legitimate rationale must be provided for these articles to remain. I hate for this to seem harsh or like it's cutting into the fun, but we do have to respect copyright even when it's a somewhat gray area. It's better, in such cases, to swing more to the legal side than the illegal side.