There are some nuances to these licenses that are discussed a lot. Namely, the "No Additional Restrictions" clause. It basically says the person using the asset cannot encrypt or hide or otherwise block the asset from being freely copied out of one project and used in another per the terms of the license.
It is often argued this clause means the asset cannot be used in games that are put on platforms like the apple app store since they may impose a form of DRM that prevents people from opening up the package and extracting the assets easily.
The debate is ongoing with no sign of ever arriving at a solid conclusion. If you're unsure, the best practice is to ask the artist who licensed the asset if they mind you using their work in such a fashion. Several artists have given a blanket waiver to this clause and don't need to be asked: http://opengameart.org/forumtopic/anti-drm-waiver
Alternatively, assets may be licensed under OGA-BY, which is essentially the same as CC-BY but without the No Additional Restrictions clause.
Another aspect of these licenses that is often discussed is whether or not the "Share Alike" clause of CC-BY-SA licenses requires a developer to share their game's entire source code or just the artwork derived directly from the asset. Again, the best practice is to ask the artist if you're unsure.
As long as your submissions here on OGA make those free assets available for download in a useable form (people aren't required to click the link to the unity appstore before they are able to use the free assets) you're all good. See Submission Guidelines for more information.
Here is an example of this very practice: http://opengameart.org/content/explosion-effects-and-more. Soluna Software shared 5 animations for free, with a link to their other commercial works on their website. Note the files listed in the "File(s)" section are the complete and useable animations spritesheets, not just a non-usable preview. However, the website has many more assets available for purchase.
It's a great way to get the word out about your work! :)
Select an Art Type on the left side of the page (probably Texture, Sound Effect, or 3D art in this case)
Select a license you like (or many. The user only has to adhere to one of the licenses you select, not all of them simultaneously) Click on each of the license images for more details on that license.
Fill out all the other fields in the middle of the page. If you don't understand anything, just ask. :)
That is a fringe case but it is indeed a valid question. I think admins here have done a pretty good job of assessing each case under its own individual merits by the spirit of the law and not the letter.
In the case of the WikiCommons example Clint provided, I imagine derivatives of that would also be taken down since the derivatives, albeit compliant with the license, would not have been in the spirit with which the ripped graphics were shared. Considering everyone except the person uploading those ripped graphics felt it was an obviously uncool move, I don't think we'll have much of a problem with similar situations.
In the case of an author requesting specific derivatives be removed but wish their original to remain on the site, I think the admin's assessment may initially sound something like "are you freaking kidding me?". If the original author licensed it for derivatives, but demands derivatives be taken down, that would call for taking the original artist into a sidebar and discussing the intricacies of Wheaton's Law. Also, I'm betting the artist would be asked to change the license to something that complies with their wishes... like CC-BY-ND... which isn't a license allowed on OGA.
I can't imagine such fringy cases ever being a reality, but even if they do happen, I'm confident in the case-by-case mitigation powers of our admins to produce a just and equitable solution for all. :)
Still, though... I'm also curious what the admins think about this.
To other artists seeing this and fearing your derivatives will be taken down: You've got nothing to fear.
As an artist, you can rest assured your hard work will not be ruined by someone else, but that also applies to all other artists as well, including the ones you may have derived your work from.
I have seen thousands of derivative works uploaded to OGA. Of those thousands, I have not seen even a single request for take-down of a work that was compliant with the original work's license. Artists just don't request take-downs that much.
There are other sites that share artwork, but I would never use them. I've seen games about to hit the big-time only to send out a message to all their fans saying "we have to shut down. There was a legal conflict with some of our assets. Once that's resolved, we'll be back" ...but they never come back. Having to rip out fundamental pieces of your game so late in development is a deathblow. The OGA community takes extra effort to ensure the assets you get here are conflict free.
Well, there really isn't a single link to download 'the best art'. But you can list all the art in order of most likes, then download them in that order.
Ongoing periodic costs for you (the shopkeeper) like rent, food, firewood. This keeps the player on their toes trying to make as much profit as possible each day.
Adventurer come into shop each day to both buy and sell stuff. Player processes adventurer requests by clicking on the item on the shelf they're shouting for, then clicking on the adventurer who wants it or something like that. incorrect clicking causes pissed off customers and delays.
At the end of each day, the shop closes and player re-stocks shelves and sets prices. Stupid adventurers keep trying to sell you rusty swords and other worthless crap. Lower the buy price on items you probably won't be able to sell and raise the sell price on super-rare magical trinkets!
Buying or selling quest items in your shop is strictly outlawed! If you get caught with quest items in your shop, the admin-wizards could levy heavy fines.
Some adventurers are thieves. If they hang around the shop too long without getting any attention from the player, they burgle an item off the shelf without paying! Optionally, buy a Ban Hammer to stop them from coming back.
Optional shop upgrades can be purchased, like extra shelves to stock more items each day, more counter space to cue up more adventurers at once. Improved signage for advertising and attracting customers. Hire a minstrel to play soothing music so waiting adventurers don't get agitated so quickly.
Interesting... In the meantime, does replacing [] with %5B%5D work?
[url=http://opengameart.org/art-search-advanced?keys=&field_art_type_tid%5B%5D=12]OGA sound effects![/url]
Here are some additional details for that overly simplified explanation:
Read up on both http://creativecommons.org/licenses/by/3.0/ and http://creativecommons.org/licenses/by-sa/3.0/
There are some nuances to these licenses that are discussed a lot. Namely, the "No Additional Restrictions" clause. It basically says the person using the asset cannot encrypt or hide or otherwise block the asset from being freely copied out of one project and used in another per the terms of the license.
It is often argued this clause means the asset cannot be used in games that are put on platforms like the apple app store since they may impose a form of DRM that prevents people from opening up the package and extracting the assets easily.
The debate is ongoing with no sign of ever arriving at a solid conclusion. If you're unsure, the best practice is to ask the artist who licensed the asset if they mind you using their work in such a fashion. Several artists have given a blanket waiver to this clause and don't need to be asked: http://opengameart.org/forumtopic/anti-drm-waiver
Alternatively, assets may be licensed under OGA-BY, which is essentially the same as CC-BY but without the No Additional Restrictions clause.
Another aspect of these licenses that is often discussed is whether or not the "Share Alike" clause of CC-BY-SA licenses requires a developer to share their game's entire source code or just the artwork derived directly from the asset. Again, the best practice is to ask the artist if you're unsure.
Yes. It is perfectly acceptable to share some of your assets here on OGA for free, with a link to your unity appstore page with additional assets non-free. See FAQ "I'm a commercial artist. Can I use OpenGameArt.org to advertise my paid work?" for more information.
As long as your submissions here on OGA make those free assets available for download in a useable form (people aren't required to click the link to the unity appstore before they are able to use the free assets) you're all good. See Submission Guidelines for more information.
Here is an example of this very practice: http://opengameart.org/content/explosion-effects-and-more. Soluna Software shared 5 animations for free, with a link to their other commercial works on their website. Note the files listed in the "File(s)" section are the complete and useable animations spritesheets, not just a non-usable preview. However, the website has many more assets available for purchase.
It's a great way to get the word out about your work! :)
Why not make these textures available on OGA instead of just discussing them in the forum?
That is a fringe case but it is indeed a valid question. I think admins here have done a pretty good job of assessing each case under its own individual merits by the spirit of the law and not the letter.
In the case of the WikiCommons example Clint provided, I imagine derivatives of that would also be taken down since the derivatives, albeit compliant with the license, would not have been in the spirit with which the ripped graphics were shared. Considering everyone except the person uploading those ripped graphics felt it was an obviously uncool move, I don't think we'll have much of a problem with similar situations.
In the case of an author requesting specific derivatives be removed but wish their original to remain on the site, I think the admin's assessment may initially sound something like "are you freaking kidding me?". If the original author licensed it for derivatives, but demands derivatives be taken down, that would call for taking the original artist into a sidebar and discussing the intricacies of Wheaton's Law. Also, I'm betting the artist would be asked to change the license to something that complies with their wishes... like CC-BY-ND... which isn't a license allowed on OGA.
I can't imagine such fringy cases ever being a reality, but even if they do happen, I'm confident in the case-by-case mitigation powers of our admins to produce a just and equitable solution for all. :)
Still, though... I'm also curious what the admins think about this.
To other artists seeing this and fearing your derivatives will be taken down: You've got nothing to fear.
As an artist, you can rest assured your hard work will not be ruined by someone else, but that also applies to all other artists as well, including the ones you may have derived your work from.
I have seen thousands of derivative works uploaded to OGA. Of those thousands, I have not seen even a single request for take-down of a work that was compliant with the original work's license. Artists just don't request take-downs that much.
There are other sites that share artwork, but I would never use them. I've seen games about to hit the big-time only to send out a message to all their fans saying "we have to shut down. There was a legal conflict with some of our assets. Once that's resolved, we'll be back" ...but they never come back. Having to rip out fundamental pieces of your game so late in development is a deathblow. The OGA community takes extra effort to ensure the assets you get here are conflict free.
that comment is spam, thomas. ignore. It will be gone soon.
Well, there really isn't a single link to download 'the best art'. But you can list all the art in order of most likes, then download them in that order.
http://opengameart.org/art-search-advanced?keys=&field_art_type_tid%5B%5D=9&field_art_type_tid%5B%5D=10&field_art_type_tid%5B%5D=7273&field_art_type_tid%5B%5D=14&field_art_type_tid%5B%5D=12&field_art_type_tid%5B%5D=13&field_art_type_tid%5B%5D=11&field_art_licenses_tid%5B%5D=2&field_art_licenses_tid%5B%5D=3&field_art_licenses_tid%5B%5D=6&field_art_licenses_tid%5B%5D=5&field_art_licenses_tid%5B%5D=10310&field_art_licenses_tid%5B%5D=4&field_art_licenses_tid%5B%5D=8&field_art_licenses_tid%5B%5D=7&field_art_tags_tid_op=and&field_art_tags_tid=&name=&sort_by=count&sort_order=DESC&items_per_page=24&Collection=
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