Update README.md

README.md

@@ -351,17 +351,5 @@ Looking for sponsors. Sponsoring I will enable us to:
 
 [Sponsorship](https://github.com/sponsors/shogo4405)
 
-## 📖 Reference
-* Adobe’s Real Time Messaging Protocol
-  * http://www.adobe.com/content/dam/Adobe/en/devnet/rtmp/pdf/rtmp_specification_1.0.pdf
-* Action Message Format -- AMF 0
-  * https://www.adobe.com/content/dam/acom/en/devnet/pdf/amf0-file-format-specification.pdf
-* Action Message Format -- AMF 3 
-  * https://www.adobe.com/content/dam/acom/en/devnet/pdf/amf-file-format-spec.pdf
-* Video File Format Specification Version 10
-  * https://www.adobe.com/content/dam/acom/en/devnet/flv/video_file_format_spec_v10.pdf
-* Adobe Flash Video File Format Specification Version 10.1
-  * http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf
-
 ## 📜 License
 BSD-3-Clause