You are purchasing an .abr file. To my knowledge, Photoshop and GIMP can open and use this type of file. Please check if your program is compatible with .abr files before purchasing.
GENERAL TOS:
• You are allowed to use this brush in personal and commercial work.
• You are allowed to edit this brush.
• You are NOT ALLOWED to resell or give-away this brush.
If you have any questions or issues, please contact me at jungabeast@gmail.com
For more detailed information about my work, go to www.jungabeast.com