update copyright overview

1 files changed, 0 insertions, 14 deletions

diff --git a/ref.bib b/ref.bib
index 8bf8fa5..c9e7fd5 100644
--- a/ref.bib
+++ b/ref.bib
@@ -996,20 +996,6 @@
   file      = {:Stallman2002 - Free Software, Free Society.pdf:PDF},
 }
 
-@Article{Singh2025,
-  author       = {Hemendra Singh},
-  date         = {2025},
-  journaltitle = {Journal of Intellectual Property Rights},
-  title        = {Concept of Copyleft},
-  doi          = {10.56042/jipr.v30i3.6225},
-  issn         = {0975-1076},
-  langid       = {american},
-  pages        = {269--273},
-  subtitle     = {Free Software, Creative Commons and Open Source},
-  volume       = {30},
-  file         = {:Singh2025 - Concept of Copyleft.pdf:PDF},
-}
-
 @Article{Morin2012,
   author       = {Andrew Morin and Jennifer Urban and Piotr Sliz},
   date         = {2012-07},