To give another deviant a direct link to this FAQ answer, use the following code in your comment or forum post:
How do I prove that I had permission to use someone's work?
For valid stock resources you should link back to the original resource and provide proper credit.
For works which were not originally stock resources you will need to provide the permissions statement or license granted by the proper owner by doing the following;
For your convenience we have provided a sample permissions document HERE.
1. Convert the permissions agreement, email, note or other written text file of permission into a JPG, PNG or PDF file. This can be as easy as taking a screenshot of the text and saving it as one of the appropriate file types.
2. Submit your finished work.
3. Browse to the deviation page of the newly submitted work and choose the option to Edit Deviation which is found to the left of the image thumbnail.
4. Click on the Choose Permissions Document button near the bottom of the page.
5. Submit the permissions statement which you had previously converted to a JPG, PNG, or PDF format.
6. Save the changes.
The permissions statement will then be logged and attached to the submission. Only the appropriate staff members will be able to view this permission statement so you do not need to be concerned about private or personal information being revealed to the public.