Did you know that no matter what gallery you submit to on dA, you HAVE to credit your sources? Hell yes!
This includes among other things images, textures, brushes, fonts etc., just to name the most commonly used Stock and Resource items.
The Photo Manipulation gallery and community f.e. takes great effort into crediting the materials used for their works and has some shining examples among its submissions, sometimes containing up to 50 seperate sources.
There are lots of great typography deviations that are pretty much Photo Manipulations, as they use a series of materials to create the final artwork.
Here are two examples of deviations that managed to credit their sources:
Make links to the materials you used or note that the materials are your own.
Eventually you are hurting yourself
If there is no credit about the materials used in an artwork, one has to assume that that material is illegitimate. This may result in your work being removed from dA for copyright violations. You give yourself a bad name, making it doubtful whether the work itself is your work at all!
Obviously these are all more or less legal reasons. I know many people don't care about this and/or think "nobody cares, nothing will happen to me", so here is a better reason:
Your deviation will NOT be featured as a Daily Deviation, if the stock is not credited.
What does this mean for Typography?
Nothing special, really. It is just a reminder, that yes, even typographers *le gasp* have to credit their sources! I came across several great pieces and DD suggestions today, which I cannot feature, due to the fact that they do not credit their sources.
While it is very obvious for all image-like material, it may not be as much for fonts.
In fact, I rarely come across deviations that credit the fonts which were used and their creators. Very often the fonts used are system fonts that are pre installed on the user's computer or they are free/bought fonts which do not require credit by the creator.
Also the legal/copyright status of fonts is not the same in all countries, especially in the US, fonts as such are not protected by copyright. Learn more about this at the article "Intellectual property protection of typefaces" on Wikipedia.
However, the legal status of fonts does not change dA's own house rules, so to speak. Credit is still required and part of the checkboxes you click when submitting a new deviation 
Basically by not crediting you are violationg dA's Submission Policy and Terms of Service. This means you may have to expect "moves" against your work and/or your account. This may sound more drastic than you think right now.Please credit your sources, goddammit!
That's all.
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