Clarify permission to fine tune

Clarify that limit in Section 1(b)(v) does not apply to fine-tunes of Playground v2.5. Fine-tunes are derivative works that have always been permitted & excluded from the restriction in the section.

LICENSE.md

@@ -30,7 +30,7 @@ iii. You must retain in all copies of the Playground Materials that you distribu
 
 iv. Your use of the Playground Materials must comply with applicable laws and regulations (including trade compliance laws and regulations) and adhere to the Use Restrictions set forth in Attachment A. You shall require all of your users who use Playground v2.5 or any derivative works thereof, to comply with the terms of this section and the restrictions in Attachment A.
 
-v. You will not use the Playground Materials or any output or results of the Playground Materials to improve any other text-to-image generative model (excluding Playground v2.5 or derivative works thereof).
+v. You will not use the Playground Materials or any output or results of the Playground Materials to improve any other text-to-image generative model (excluding Playground v2.5 or derivative works thereof). Fine-tuning Playground v2.5 is expressly permitted as a derivative work.
 
 ## 2. Additional Commercial Terms.
 If, at any time, (a) image generation or image editing is a core business or product of Licensee’s and (b) the total monthly unique users (MUU) of the products or services made available by or for Licensee, or Licensee’s affiliates, for such products or services is greater than 1 million MUUs in the preceding calendar month, then immediately thereafter you must request a license from Playground. Playground may grant this license to you in its sole discretion and you are not authorized to exercise any of the rights under this Agreement unless or until Playground otherwise expressly grants you such rights as a Licensee.